The following are true about iris: a. it receives 5% of total blood flow b. it contains blood vessels with radial coils c. it contains fenestration in the blood vessels d. the sympathetic activity in the iris dilator muscles is mainly mediated by receptors

The following are true about iris:
a. it receives 5% of total blood flow
b. it contains blood vessels with radial coils
c. it contains fenestration in the blood vessels
d. the sympathetic activity in the iris dilator muscles
is mainly mediated by receptors
by

1 Answer

Answer :

it contains blood vessels with radial coils
by

Related questions

True statements about the retinal blood flow include: a. the retina receives 5% of total ocular blood flow b. the retinal blood flow is mainly under the sympathetic control c. the retina blood vessels are impermeable to ascorbate d. the pericytes control the contractile activity of the retinal blood vessels

Description : True statements about the retinal blood flow include: a. the retina receives 5% of total ocular blood flow b. the retinal blood flow is mainly under the sympathetic control c. the ... are impermeable to ascorbate d. the pericytes control the contractile activity of the retinal blood vessels

Last Answer : the pericytes control the contractile activity of the retinal blood vessels

The following are true about pupil reaction to light: a. secretion of acetylcholine is responsible for pupil dilatation b. constriction of the pupil is mediated by nerve fibres travelling in the short ciliary nerve c. dilatation of the pupil is mediated by nerve fibres travelling in the long ciliary nerve d. the sympathetic nerve innervates the dilator muscles

Description : The following are true about pupil reaction to light: a. secretion of acetylcholine is responsible for pupil dilatation b. constriction of the pupil is mediated by nerve fibres travelling in ... fibres travelling in the long ciliary nerve d. the sympathetic nerve innervates the dilator muscles

Last Answer : the sympathetic nerve innervates the dilator muscles

The following action of adrenaline is not mediated by β receptors: A. Dilatation of blood vessels B. Dilatation of pupil C. Bronchodilation D. Renin release from kidney

Description : The following action of adrenaline is not mediated by β receptors: A. Dilatation of blood vessels B. Dilatation of pupil C. Bronchodilation D. Renin release from kidney

Last Answer : B. Dilatation of pupil

Inhibition of the Edinger-Westphal nucleus: a. causes relaxation of the iris sphincter b. causes contraction of the iris dilator c. occurs in deep sleep d. occurs with narcotics

Description : Inhibition of the Edinger-Westphal nucleus: a. causes relaxation of the iris sphincter b. causes contraction of the iris dilator c. occurs in deep sleep d. occurs with narcotics

Last Answer : causes contraction of the iris dilator

With regard to the choroid: a. the choroid receives 85% of blood flow to the eye b. the blood vessels in the choroid contains tight junction c. the choroid vessels are embedded in a matrix made up of type III collagen d. in the presence of high partial pressure of carbon dioxide the choroidal vessels increase in diameter

Description : With regard to the choroid: a. the choroid receives 85% of blood flow to the eye b. the blood vessels in the choroid contains tight junction c. the choroid vessels are embedded in ... d. in the presence of high partial pressure of carbon dioxide the choroidal vessels increase in diameter

Last Answer : in the presence of high partial pressure of carbon dioxide the choroidal vessels increase in diameter

The following is true of loperamide except: A. It is absorbed from intestines and exerts centrally mediated antidiarrhoeal action B. It acts on the opioid receptors in the gut C. It increases tone and segmenting activity of the intestines D. It inhibits intestinal secretion by binding to calmodulin in the mucosal cells

Description : The following is true of loperamide except: A. It is absorbed from intestines and exerts centrally mediated antidiarrhoeal action B. It acts on the opioid receptors in the gut C. It increases ... of the intestines D. It inhibits intestinal secretion by binding to calmodulin in the mucosal cells

Last Answer : A. It is absorbed from intestines and exerts centrally mediated antidiarrhoeal action

With regard to the autonomic nervous system: a. the dorsal root ganglia is made up mainly of the cell bodies of the sympathetic nerves b. the preganglionic sympathetic fibres are usually longer than preganglionic parasympathetic fibres c. acetylcholine is the neurotransmitter at the ganglia of both sympathetic and parasympathetic nervous system d. botulin toxin blocks acetylcholine receptors

Description : With regard to the autonomic nervous system: a. the dorsal root ganglia is made up mainly of the cell bodies of the sympathetic nerves b. the preganglionic sympathetic fibres ... the ganglia of both sympathetic and parasympathetic nervous system d. botulin toxin blocks acetylcholine receptors

Last Answer : the dorsal root ganglia is made up mainly of the cell bodies of the sympathetic nerves

The most likely mechanism of antihypertensive action of thiazide diuretics in the long-term is: A. Reduction of circulating blood volume B. Reduction in cardiac output C. Decreased sympathetic tone D. Reduction in total peripheral vascular resistance and improved compliance of resistance vessels

Description : The most likely mechanism of antihypertensive action of thiazide diuretics in the long-term is: A. Reduction of circulating blood volume B. Reduction in cardiac output C. Decreased sympathetic tone D. Reduction in total peripheral vascular resistance and improved compliance of resistance vessels

Last Answer : D. Reduction in total peripheral vascular resistance and improved compliance of resistance vessels

The endothelium: a. maintains the integrity of the corneal stroma through an ATP-Na+, K+-dependent pump b. receives its nutrient from the blood vessels surrounding the cornea c. undergoes multiplication in response to trauma d. contains tight junction between adjacent endothelium

Description : The endothelium: a. maintains the integrity of the corneal stroma through an ATP-Na+, K+-dependent pump b. receives its nutrient from the blood vessels surrounding the cornea c. undergoes multiplication in response to trauma d. contains tight junction between adjacent endothelium

Last Answer : maintains the integrity of the corneal stroma through an ATP-Na+, K+-dependent pump

In the more highly developed animals, such as humans this gas is used to regulate the activity of the heart, the blood vessels, and the respiratory system. WORKING MUSCLES PRODUCE A LARGE AMOUNT OF THI SUBSTANCE. Narcosis due to this gas is characterized by mental disturbances which can include confusion, headache, low blood pressure and hypothermia. Name this gas.

Description : In the more highly developed animals, such as humans this gas is used to regulate the activity of the heart, the blood vessels, and the respiratory system. WORKING MUSCLES PRODUCE A ... mental disturbances which can include confusion, headache, low blood pressure and hypothermia. Name this gas.

Last Answer : ANSWER: Carbon Dioxide or CO2 

Which of the following statement(s) is/are true concerning the neuroendocrine responses to shock? a. Sympathetic nerve endings release epinephrine which is responsible for greater than 80% of systemic vascular resistance b. Endogenous epinephrine is the primary contributor to systemic vascular resistance c. Increased pancreatic secretion of glucagon contributes to glucose intolerance associated with injury and sepsis d. The renin-angiotensin axis further augments the sympathetic-mediated vasoconstriction

Description : Which of the following statement(s) is/are true concerning the neuroendocrine responses to shock? a. Sympathetic nerve endings release epinephrine which is responsible for greater than 80% ... injury and sepsis d. The renin-angiotensin axis further augments the sympathetic-mediated vasoconstriction

Last Answer : Answer: c, d The neuroendocrine response to shock attempts to achieve restoration of effective blood volume, mobilization of metabolic substrates, and maintenance of central ... . Angiotensin II is an extremely effective vasoconstrictor that further augments sympathetic-mediated vasoconstriction

All of the following contribute to the antihypertensive action of propranolol except: A. Direct vasodilatation B. Decreased renin release from kidney C. Adaptation of blood vessels to reduced cardiac output D. Less noradrenaline release from sympathetic nerve endings

Description : All of the following contribute to the antihypertensive action of propranolol except: A. Direct vasodilatation B. Decreased renin release from kidney C. Adaptation of blood vessels to reduced cardiac output D. Less noradrenaline release from sympathetic nerve endings

Last Answer : A. Direct vasodilatation

All of the following contribute to the antihypertensive action of propranolol except: A. Direct vasodilatation B. Decreased renin release from kidney C. Adaptation of blood vessels to reduced cardiac output D. Less noradrenaline release from sympathetic nerve endings

Description : All of the following contribute to the antihypertensive action of propranolol except: A. Direct vasodilatation B. Decreased renin release from kidney C. Adaptation of blood vessels to reduced cardiac output D. Less noradrenaline release from sympathetic nerve endings

Last Answer : A. Direct vasodilatation

Adrenergic neurone blocking drugs: A. Block the action of adrenaline on neuronal α2 adrenoceptors B. Block both α and β adrenoceptor mediated effects of injected adrenaline C. Do not block any effect of injected adrenaline D. Do not block the effects of sympathetic nerve

Description : Adrenergic neurone blocking drugs: A. Block the action of adrenaline on neuronal α2 adrenoceptors B. Block both α and β adrenoceptor mediated effects of injected adrenaline C. Do not block any effect of injected adrenaline D. Do not block the effects of sympathetic nerve

Last Answer : C. Do not block any effect of injected adrenaline

Adrenergic neurone blocking drugs: A. Block the action of adrenaline on neuronal α2 adrenoceptors B. Block both α and β adrenoceptor mediated effects of injected adrenaline C. Do not block any effect of injected adrenaline D. Do not block the effects of sympathetic nerve stimulation

Description : Adrenergic neurone blocking drugs: A. Block the action of adrenaline on neuronal α2 adrenoceptors B. Block both α and β adrenoceptor mediated effects of injected adrenaline C. Do not block any effect of injected adrenaline D. Do not block the effects of sympathetic nerve stimulation

Last Answer : C. Do not block any effect of injected adrenaline

Methyldopa lowers BP by: A. Inhibiting dopa decarboxylase in adrenergic nerve endings B. Generating α-methyl noradrenaline in brain which reduces sympathetic tone C. Generating α-methyl noradrenaline which acts as a false transmitter in peripheral adrenergic nerve endings D. Activating vascular dopamine receptors

Description : Methyldopa lowers BP by: A. Inhibiting dopa decarboxylase in adrenergic nerve endings B. Generating α-methyl noradrenaline in brain which reduces sympathetic tone C. Generating α-methyl ... as a false transmitter in peripheral adrenergic nerve endings D. Activating vascular dopamine receptors

Last Answer : B. Generating α-methyl noradrenaline in brain which reduces sympathetic tone

Select the action of vasopressin exerted through the V1 subtype receptors: A. Release of coagulation factor VIII and von Willebrands factor from vascular endothelium B. Increased peristalsis of gut C. Dilatation of blood vessels D. Increased water permeability of renal collecting ducts

Description : Select the action of vasopressin exerted through the V1 subtype receptors: A. Release of coagulation factor VIII and von Willebrands factor from vascular endothelium B. Increased peristalsis of gut C. Dilatation of blood vessels D. Increased water permeability of renal collecting ducts

Last Answer : B. Increased peristalsis of gut

Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when(a) AV node receives signal from SA node (b) AV valves open up (c) Ventricular walls vibrate due to gushing in of blood from atria (d) Semilunar valves close down after the blood flows into vessels from ventricles.

Description : Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when (a) AV node receives signal from SA node (b) AV valves open up (c) Ventricular ... blood from atria (d) Semilunar valves close down after the blood flows into vessels from ventricles.

Last Answer : (d) Semilunar valves close down after the blood flows into vessels from ventricles

Which of the following terms best describes the antagonism of leukotriene’s bronchoconstrictor effect (mediated at leukotriene receptors) by terbutaline (acting a adrenoceptors) in a patient with asthma? (a) Pharmacologic antagonist (b) Partial agonist (c) Physiologic antagonist (d) Chemical antagonist (e) Noncompetitive antagonist

Description : Which of the following terms best describes the antagonism of leukotriene's bronchoconstrictor effect (mediated at leukotriene receptors) by terbutaline (acting a adrenoceptors) in a patient with ... ) Partial agonist (c) Physiologic antagonist (d) Chemical antagonist (e) Noncompetitive antagonist

Last Answer : Ans: C

Choose the correct statement about ticlopidine: A. It blocks GPIIb/IIIa receptors on platelet membrane B. It prevents ADP mediated platelet adenylylcyclase inhibition C. It inhibits thromboxane A2 synthesis in platelets D. It does not prolong bleeding time

Description : Choose the correct statement about ticlopidine: A. It blocks GPIIb/IIIa receptors on platelet membrane B. It prevents ADP mediated platelet adenylylcyclase inhibition C. It inhibits thromboxane A2 synthesis in platelets D. It does not prolong bleeding time

Last Answer : B. It prevents ADP mediated platelet adenylylcyclase inhibition

The vasopressin action(s) mediated by V2 receptors include(s): A. Increased water permeability of collecting duct cells B. Increased urea permeability of collecting duct cells C. Vasoconstriction D. Both 'A' and 'B

Description : The vasopressin action(s) mediated by V2 receptors include(s): A. Increased water permeability of collecting duct cells B. Increased urea permeability of collecting duct cells C. Vasoconstriction D. Both 'A' and 'B

Last Answer : D. Both 'A' and 'B

The action of histamine that is not mediated through H1 receptors is: A. Release of EDRF from vascular endothelium resulting in vasodilatation B. Direct action on vascular smooth muscle causing vasodilatation C. Bronchoconstriction D. Release of catecholamines from adrenal medulla

Description : The action of histamine that is not mediated through H1 receptors is: A. Release of EDRF from vascular endothelium resulting in vasodilatation B. Direct action on vascular smooth muscle causing vasodilatation C. Bronchoconstriction D. Release of catecholamines from adrenal medulla

Last Answer : B. Direct action on vascular smooth muscle causing vasodilatation

The following action of adrenaline is mediated by both α and β receptors producing the same directional effect: A. Cardiac stimulation B. Intestinal relaxation C. Dilatation of pupil D. Bronchodilatation

Description : The following action of adrenaline is mediated by both α and β receptors producing the same directional effect: A. Cardiac stimulation B. Intestinal relaxation C. Dilatation of pupil D. Bronchodilatation

Last Answer : B. Intestinal relaxation

The action of histamine that is not mediated through H1 receptors is: A. Release of EDRF from vascular endothelium resulting in vasodilatation B. Direct action on vascular smooth muscle causing vasodilatation C. Bronchoconstriction D. Release of catecholamines from adrenal medulla

Description : The action of histamine that is not mediated through H1 receptors is: A. Release of EDRF from vascular endothelium resulting in vasodilatation B. Direct action on vascular smooth muscle causing vasodilatation C. Bronchoconstriction D. Release of catecholamines from adrenal medulla

Last Answer : B. Direct action on vascular smooth muscle causing vasodilatation

The following action of adrenaline is mediated by both α and β receptors producing the same directional effect: A. Cardiac stimulation B. Intestinal relaxation C. Dilatation of pupil D. Bronchodilatation

Description : The following action of adrenaline is mediated by both α and β receptors producing the same directional effect: A. Cardiac stimulation B. Intestinal relaxation C. Dilatation of pupil D. Bronchodilatation

Last Answer : B. Intestinal relaxation

Which of the following effects of epinephrine would be blocked by phentolamine but not by metoprolol ? (a) Cardiac stimulation (b) Contractionof radial smooth muscle in the iris (c) Increase of camp in fat (d) Relaxation of bronchial smooth muscle (e) Relaxation of the uterus

Description : Which of the following effects of epinephrine would be blocked by phentolamine but not by metoprolol ? (a) Cardiac stimulation (b) Contractionof radial smooth muscle in the iris (c) Increase of camp in fat (d) Relaxation of bronchial smooth muscle (e) Relaxation of the uterus

Last Answer : Ans: B

Neuromuscular blocking drugs do not produce central actions because: A. They do not cross the blood-brain barrier B. Nicotinic receptors are not present in the brain C. They are sequestrated in the periphery by tight binding to the skeletal muscles D. They do not ionise at the brain pH

Description : Neuromuscular blocking drugs do not produce central actions because: A. They do not cross the blood-brain barrier B. Nicotinic receptors are not present in the brain C. They are sequestrated in the periphery by tight binding to the skeletal muscles D. They do not ionise at the brain pH

Last Answer : A. They do not cross the blood-brain barrier

Choose the incorrect statement from the following (a) Sympathetic system increases rate of SA node (b) Sympathetic system causes constriction of coronary arteries (c) Sympathetic system causes increased motility of GIT smooth muscles (d) Sympathetic system causes constriction of sphincter in GIT

Description : Choose the incorrect statement from the following (a) Sympathetic system increases rate of SA node (b) Sympathetic system causes constriction of coronary arteries (c) Sympathetic system causes increased motility of GIT smooth muscles (d) Sympathetic system causes constriction of sphincter in GIT

Last Answer : Ans: C

When the patient who has experienced trauma to an extremity complains of severe burning pain, vasomotor changes, and muscles spasms in the injured extremity, the nurse recognizes that the patient is likely demonstrating signs of a) reflex sympathetic dystrophy syndrome. RSD is frequently chronic and occurs most often in women.

Description : When the patient who has experienced trauma to an extremity complains of severe burning pain, vasomotor changes, and muscles spasms in the injured extremity, the nurse ... heterotrophic ossification. Heterotrophic ossification causes muscular pain and limited muscular contraction and movement.

Last Answer : a) reflex sympathetic dystrophy syndrome. RSD is frequently chronic and occurs most often in women.

Identify the site where Wuchereria bancrofti is normally found in human body. (a) Muscles of the legs (b) Blood vessels of the thigh region (c) Skin between the fingers (d) Lymphatic vessels of the lower limbs

Description : Identify the site where Wuchereria bancrofti is normally found in human body. (a) Muscles of the legs (b) Blood vessels of the thigh region (c) Skin between the fingers (d) Lymphatic vessels of the lower limbs

Last Answer : (d) Lymphatic vessels of the lower limbs

The following factors enhance renin release from the kidney except: A. Fall in blood pressure B. Reduction in blood volume C. Enhanced sympathetic activity D. Volume overload

Description : The following factors enhance renin release from the kidney except: A. Fall in blood pressure B. Reduction in blood volume C. Enhanced sympathetic activity D. Volume overload

Last Answer : D. Volume overload

Which of the following statement(s) is/are true concerning the various types of shock? a. Traumatic shock is more commonly associated with subsequent organ injury and multiorgan failure syndrome than hemorrhagic shock b. Cardiogenic shock can be of either an intrinsic or compressive nature c. Hypodynamic septic shock is associated with a decreased mortality risk when compared with hyperdynamic septic shock d. Hypoadrenal shock usually responds quickly to resuscitation e. Neurogenic shock occurs with the absence of sympathetic activity

Description : Which of the following statement(s) is/are true concerning the various types of shock? a. Traumatic shock is more commonly associated with subsequent organ injury and multiorgan failure ... responds quickly to resuscitation e. Neurogenic shock occurs with the absence of sympathetic activity

Last Answer : Answer: a, b, d, e Classification schemes of shock based on cause have been developed for the seemingly dissimilar processes leading to circulatory collapse and the shock state. ... and pressor agents. The response to exogenous corticosteroids is usually dramatic and potentially life-saving

High purity nitrogen is used in (A) Making protective gas (95% N2 + 5% H2 ) for annealing of cold rolled steel strip coils (B) Fire fighting purposes (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : High purity nitrogen is used in (A) Making protective gas (95% N2 + 5% H2 ) for annealing of cold rolled steel strip coils (B) Fire fighting purposes (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

Choose the correct statement about the action of nitrates on coronary vessels (a) They mitigate angina pectoris by increasing total coronary flow (b) They preferentially dilate conducting arteries without affecting resistance arterioles (c) They preferentially dilate autoregulatory arterioles without affecting the larger arteries (d) They increase subepicardial blood flow without affecting subendocardial blood flow

Description : Choose the correct statement about the action of nitrates on coronary vessels (a) They mitigate angina pectoris by increasing total coronary flow (b) They preferentially dilate conducting ... the larger arteries (d) They increase subepicardial blood flow without affecting subendocardial blood flow

Last Answer : Ans: B

A drug which preferentially dilates autoregulatory coronary arterioles with little effect on large conducting vessels is likely to: A. Evoke coronary steal phenomenon B. Mitigate classical angina but not variant angina C. Decrease total coronary blood flow in healthy subjects D. Avert ECG changes of ischaemia

Description : A drug which preferentially dilates autoregulatory coronary arterioles with little effect on large conducting vessels is likely to: A. Evoke coronary steal phenomenon B. Mitigate classical angina but not ... . Decrease total coronary blood flow in healthy subjects D. Avert ECG changes of ischaemia

Last Answer : A. Evoke coronary steal phenomenon

Choose the correct statement about the action of nitrates on coronary vessels: A. They mitigate angina pectoris by increasing total coronary flow B. They preferentially dilate conducting arteries without affecting resistance arterioles C. They preferentially dilate autoregulatory arterioles without affecting the larger arteries D. They increase subepicardial blood flow without affecting subendocardial blood flow

Description : Choose the correct statement about the action of nitrates on coronary vessels: A. They mitigate angina pectoris by increasing total coronary flow B. They preferentially dilate conducting ... the larger arteries D. They increase subepicardial blood flow without affecting subendocardial blood flow

Last Answer : B. They preferentially dilate conducting arteries without affecting resistance arterioles

Stimulation of the beta receptors give rise to: a. tachycardia b. increased myocardial contraction c. vasoconstriction of visceral vessels d. pupil dilatation

Description : Stimulation of the beta receptors give rise to: a. tachycardia b. increased myocardial contraction c. vasoconstriction of visceral vessels d. pupil dilatation

Last Answer : increased myocardial contraction

Ergotamine relieves migraine by: A. Blocking vascular α adrenergic receptors B. Blocking vascular 5-HT2 receptors C. Dilating cranial arterio-venous shunt channels D. Constricting cranial vessels and reducing perivascular neurogenic inflammation

Description : Ergotamine relieves migraine by: A. Blocking vascular α adrenergic receptors B. Blocking vascular 5-HT2 receptors C. Dilating cranial arterio-venous shunt channels D. Constricting cranial vessels and reducing perivascular neurogenic inflammation

Last Answer : D. Constricting cranial vessels and reducing perivascular neurogenic inflammation

Which of the following organs is innervated only by parasympathetic nerves ? (a) Iris muscles (b) Ciliary muscle (c) Sweat glands (d) Splenic capsule

Description : Which of the following organs is innervated only by parasympathetic nerves ? (a) Iris muscles (b) Ciliary muscle (c) Sweat glands (d) Splenic capsule

Last Answer : Ans: B

When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because (a) The eye muscles cannot immediately change the focal length of the eye lens (b) The retina retains the bright images for some time and becomes momentarily insensitive (c) The iris is unable to contract the pupil immediately (d) The iris is unable to dilate the pupil immediately

Description : When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because (a) The eye muscles cannot immediately change the focal length of the eye ... iris is unable to contract the pupil immediately (d) The iris is unable to dilate the pupil immediately

Last Answer : Ans:(d)

The transparent lens in the human eye is held in its place by (a) ligaments attached to the ciliary body (b) ligaments attached to the iris (c) smooth muscles attached to the iris (d) smooth muscles attached to the ciliary body

Description : The transparent lens in the human eye is held in its place by (a) ligaments attached to the ciliary body (b) ligaments attached to the iris (c) smooth muscles attached to the iris (d) smooth muscles attached to the ciliary body

Last Answer : (a) ligaments attached to the ciliary body

The transparent lens in the human eye is held in its place by (1) ligaments attached to the ciliary body (2) ligaments attached to the iris (3) smooth muscles attached to the iris (4) smooth muscles attached to the ciliary body

Description : The transparent lens in the human eye is held in its place by (1) ligaments attached to the ciliary body (2) ligaments attached to the iris (3) smooth muscles attached to the iris (4) smooth muscles attached to the ciliary body

Last Answer : (1) ligaments attached to the ciliary body

Which of the following organs is innervated only by parasympathetic nerves: A. Iris muscles B. Ciliary muscle C. Sweat glands D. Splenic capsule

Description : Which of the following organs is innervated only by parasympathetic nerves: A. Iris muscles B. Ciliary musclele C. Sweat glands D. Splenic capsu

Last Answer : B. Ciliary musclele

Which of the following organs is innervated only by parasympathetic nerves: A. Iris muscles B. Ciliary muscle C. Sweat glands D. Splenic capsule

Description : Which of the following organs is innervated only by parasympathetic nerves: A. Iris muscles B. Ciliary muscle C. Sweat glands D. Splenic capsule

Last Answer : B. Ciliary muscle

When a person walking in bright Sunlight enters a dark room, he is not able to see clearly for a little while because (1) the eye muscles cannot immediately adjust the focal length of the eye lens. (2) the retina retains the bright images for sometime and becomes momentarily insensitive. (3) the iris is unable to contract the pupil immediately. (4) the iris is unable to dilate the pupil immediately.

Description : When a person walking in bright Sunlight enters a dark room, he is not able to see clearly for a little while because (1) the eye muscles cannot immediately adjust the focal length of the eye ... is unable to contract the pupil immediately. (4) the iris is unable to dilate the pupil immediately.

Last Answer : the iris is unable to dilate the pupil immediately.

The figures (A – D) show four animals. Select the correct option with respect to a common characteristic of two of these animals. (A) (B) (C) (D) (a) (A) and (D) respire mainly through body wall. (b) (B) and (C) show radial symmetry. (c) (A) and (B) have cnidoblasts for self-defence. (d) (C) and (D) have a true coelom

Description : The figures (A - D) show four animals. Select the correct option with respect to a common characteristic of two of these animals. (A) (B) (C) (D) (a) (A) and (D) respire mainly through body wall. (b) ... . (c) (A) and (B) have cnidoblasts for self-defence. (d) (C) and (D) have a true coelom

Last Answer : (d) (C) and (D) have a true coelom.

Full activation of the sympathetic nervous system, as in maximal exercise, can produce all of the following responses except (a) Bronchial relaxation (b) Decreases intestinal motility (c) Increased renal blood flow (d) Mydriasis (e) Increased heart rate (tachycardia)

Description : Full activation of the sympathetic nervous system, as in maximal exercise, can produce all of the following responses except (a) Bronchial relaxation (b) Decreases intestinal motility (c) Increased renal blood flow (d) Mydriasis (e) Increased heart rate (tachycardia)

Last Answer : Ans: C

Isoxsuprine increases limb blood flow in normal individuals, but is of limited efficacy in Buerger’s disease, because in this disease: A. Vasodilator β adrenoceptors are deficient B. There is loss of sympathetic innervation C. Blood flow to the affected limb is reduced by organic obstruction D. The drug is not delivered to the affected site

Description : Isoxsuprine increases limb blood flow in normal individuals, but is of limited efficacy in Buerger's disease, because in this disease: A. Vasodilator β adrenoceptors are deficient B. There is loss ... affected limb is reduced by organic obstruction D. The drug is not delivered to the affected site

Last Answer : C. Blood flow to the affected limb is reduced by organic obstruction