Description : Consider the following statements: 1. When a nerve fibre is stimulated, a profound change is produced in the electrical properties of surface membrane and in steady potential. 2. Upon excitation, the resting potentialis suddenly changed. 3. It is due ... 1, 2, 3 (b) 2, 3 (c) 1, 2, 3, 4 (d) 1, 2, 4
Last Answer : Ans:(d)
Description : The action potential of a neuron a. is initiated by efflux of Na+ b. is terminated by efflux of K+ c. declines in amplitude as it moves along the axon d. results in a transient reversal of the ... the cell membrane e. is not associated with any net movement of Na+ or K+ across the cell membrane
Last Answer : is terminated by efflux of K+
Description : The following processes depend on changes in membrane conductance to Na and K. a. Action potential b. depolarization c. repolarization d. all of them
Last Answer : all of them
Description : During the propagation of a nerve impulse, the action potential results from the movement of (a) K+ ions from intracellular fluid to extracellular fluid (b) Na+ ions from extracellular ... extracellular fluid to intracellular fluid (d) Na+ ions from intracellular fluid to extracellular fluid.
Last Answer : (b) Na+ ions from extracellular fluid to intracellular fluid
Description : Generation of action potential concern with which layer of retina
Last Answer : Generation of action potential concern with which layer of retina
Description : When a stimulus is applied on axonal membrane then generation of action potential is due to
Last Answer : When a stimulus is applied on axonal membrane then generation of action potential is due to
Description : Generation of action potential in stage of
Last Answer : Generation of action potential in stage of
Description : Dantrolene sodium reduces skeletal muscle tone by: A. Reducing acetylcholine release from motor nerve endings B. Suppressing spinal polysynaptic reflexes C. Inhibiting the generation of muscle action potential D. Reducing Ca2+ release from sarcoplasmic reticulum in the muscle fibre
Last Answer : D. Reducing Ca2+ release from sarcoplasmic reticulum in the muscle fibre
Description : The second generation H1 antihistaminics have the following advantages except: A. Lack of anticholinergic side effects B. Lack of alcohol potentiating potential C. Recipient can drive motor vehicles D. Good antipruritic action
Last Answer : D. Good antipruritic action
Description : Actions of 5-HT2 receptor activation are primarily mediated by: A. Increased membrane permeability to Na+ ions B. Increased formation of cAMP C. Activation of guanylyl cyclase D. Generation of inositol trisphosphate and diacyl glycerols
Last Answer : D. Generation of inositol trisphosphate and diacyl glycerols
Description : Consider the following statements: 1. In a resting neuron, there is difference in electrical charge on either side of surface membrane called potential difference. 2. It is due to unequal distribution of K+ ions and Na+ ions on either side if the ... ? (a) 1 only (b) 1, 2 (c) 1, 2, 3 (d) 1, 2, 3, 4
Last Answer : Ans:(b)
Description : The following are true about the synaptic potential: a. the Na+ and K+ currents occurs simultaneously b. is a graded potential c. the channel is ligand-gated d. the post-synaptic potential is inhibitory when depolarizing
Last Answer : the Na+ and K+ currents occurs simultaneously
Description : The resting membrane potential of a cell a. is dependent on the permeability of the cell membrane to K+ being greater than the permeability to Na+ b. falls to zero immediately when Na+ ... the equilibrium potential for Na+ e. is markedly altered if the extracellular Na+ concentration is increased
Last Answer : is dependent on the permeability of the cell membrane to K+ being greater than the permeability to Na+
Description : Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on (a) membrane potential (b) accumulation of Na+ ions (c) accumulation of K+ ions (d) proton gradient.
Last Answer : (d) proton gradient
Description : Cyclic nucleotides exert the following action on salt transport across intestinal mucosal cells: A. Both cyclic AMP and cyclic GMP enhance Cland HCO3 - secretion B. Cyclic AMP enhances but cyclic GMP ... Cl- reabsorption D. Both cyclic AMP and cyclic GMP enhance Na+ and Cl- reabsorption
Last Answer : A. Both cyclic AMP and cyclic GMP enhance Cland HCO3 – secreti
Description : Thiazide diuretics enhance K+ elimination in urine primarily by: A. Inhibiting proximal tubular K+ reabsorption B. Inhibiting Na+ K+-2Cl- cotransport in the ascending limb of loop of Henle C ... in the distal tubular fluid to exchange with interstitial K+ D. Potentiating the action of aldosterone
Last Answer : C. Increasing the availability of Na+ in the distal tubular fluid to exchange with interstitial K
Description : he following is true of nifedipine except: A. It can aggravate urine voiding difficulty in elderly males with prostatic hypertrophy B. It promotes Na+ retention by a renal tubular action to ... release from pancreas D. At high doses it can paradoxically increase the frequency of angina pectori
Last Answer : B. It promotes Na+ retention by a renal tubular action to cause ankle oedema as side effect
Description : The principal action common to all class I antiarrhythmic drugs is: A. Na+ channel blockade B. K+ channel opening C. Depression of impulse conduction D. Prolongation of effective refractory period
Last Answer : A. Na+ channel blockade
Description : The positive inotropic action of digoxin takes several hours to develop because: A. Binding of digoxin to Na+K+ATPase is slow B. After Na+K+ATPase inhibition by digoxin, Ca2+ loading of myocardial ... +ATPase through modification of gene function which takes time D. Both A' and B' are correc
Last Answer : D. Both ‘A’ and ‘B’ are correct
Description : Angiotensin III is equipotent to angiotensin II in: A. Releasing aldosterone from adrenal cortex B. Promoting Na+ and water reabsorption by direct intrarenal action C. Causing vasoconstriction D. Contracting intestinal smooth muscle
Last Answer : A. Releasing aldosterone from adrenal cortex
Description : The most probable mechanism of anticonvulsant action of phenytoin is: A. Facilitation of GABAergic inhibitory transmission B. Hyperpolarization of neurones C. Interaction with Ca2+ channels to promote Ca2+ influx D. Prolongation of voltage sensitive neuronal Na+ channel inactivation
Last Answer : D. Prolongation of voltage sensitive neuronal Na+ channel inactivation
Description : e primary mechanism by which general anaesthetics produce their action is: A. Affecting receptor operated ion channels in cerebral neurones B. Blocking voltage sensitive Na+ channels in neuronal ... activity of cerebral neurones D. Blocking production of high energy phosphates in the brain
Last Answer : A. Affecting receptor operated ion channels in cerebral neurones
Description : Adverse consequences of excess mineralocorticoid action include the following except: A. Na+ and water retention B. Acidosis C. Aggravation of CHF associated myocardial fibrosis D. Rise in blood pressure
Last Answer : B. Acidosis
Description : The Na+ retaining action of aldosterone is exerted on the: A. Proximal convoluted tubule B. Ascending limb of loop of Henle C. Cortical diluting segment D. Distal convoluted tubul
Last Answer : D. Distal convoluted tubule
Description : Tetrodotoxin blocks nerve impulse/junctional transmission by: A. Anticholinergic action B. Depleting acetylcholine C. Blocking Na+ channels D. Blocking Ca2+ channels
Last Answer : C. Blocking Na+ channels
Description : Fees paid by advertisers to online company that refer qualified potential customers or provide consumer information where the consumer opts in to being contacted by a marketer. This is referred to as: 1. Lead generation 2. Search 3. Rich media 4. Social media marketing
Last Answer : Lead generation
Description : The power generation potential in mini hydro power plant for a water flow of 3 m3 /sec with a head of 14 meters and with a system efficiency of 55% is a) 226.6 kW b) 76.4 kW c) 23.1 kW d) none of the above
Last Answer : a) 226.6 kW
Description : Who is the person who holds a key position in the newspaper organization; he is responsible for the activities of income generation role of the newspaper? a) Editor b) Publisher c) Advertising Manager d) Circulation Manager
Last Answer : c) Advertising Manager
Description : What is the difference between resting potential and action potential? -Biology
Last Answer : answer:
Description : What is the role of the brain in reflex action ? -Biology-10
Last Answer : There is no role of brain in reflex action. These involuntary actions are controlled by the spinal cord which take place immediately without thinking of how to respond to the stimuli.
Description : What is the role of second messenger in hormone action? -Biology
Description : What is the role of second messenger in the mechanism of protein hormone action? -Biology
Description : As Kathy works on the prototype of a new action -orientated computer game module, she is engaging in which phase of the new product development process? A)idea generation B)commercialisation C)test marketing D)screening E)product development
Last Answer : E)product development
Description : Anthelmintic action of piperazine is due to: A. Interference with ATP generation in the worm B. Blockade of glucose uptake by the worm C. Hyperpolarization of nematode muscle by GABA agonistic action D. Depolarization of nematode muscle by activating nicotinic receptors
Last Answer : C. Hyperpolarization of nematode muscle by GABA agonistic action
Description : The following is not a feature of second generation antihistaminics: A. Nonimpairment of psychomotor performance B. High antimotion sickness activity C. Absence of anticholinergic/anti5 -HTa ctions D. Additional mechanisms of antiallergic action
Last Answer : B. High antimotion sickness activity
Description : In which the following has the ability to generate action potential without any external stimuli ?
Last Answer : In which the following has the ability to generate action potential without any external stimuli ? A. Sino ... C. Purkinje fibres D. All of the above
Description : a. SAN generates as action potential which stimulates atrial systole. b. ECG is an electrical representation of the graphical activity of the heart du
Last Answer : a. SAN generates as action potential which stimulates atrial systole. b. ECG is an electrical ... one of the main symptoms of this disease.
Description : What is the difference between resting potential and action potential?
Last Answer : Feel Free to Answer
Description : Which of the following is an orally active drug that blocks sodium channels and decreases action potential duration? (a) Adenosine (b) Amiodarone (c) Disopyramide (d) Esmolol (e) Mexiletine
Last Answer : Ans: E
Description : When used as an antiarrhythmic drug, Lidocaine typically (a) Increases action potential duration (b) Increases contractility (c) Increses PR interval (d) Reduces abnormal automaticity (e) Reduces resting potential
Last Answer : Ans: D
Description : Following statement is true about lidocaine (a) Reduce the slope of Phase 4 (b) Threshold excitability is not altered (c) Action potential is not affected (d) All of the above
Last Answer : Ans: A
Description : In cardiac cells, adenosine (a) Causes shortening of action potential duration (b) Depolarization (c) Increase in normal automaticity (d) All of the above
Description : Procainamide differs from quinidine in the following respect (a) It does not cause paradoxical tachycardia (b) It has no alfa adrenergic blocking activity (c) It has little antivagal action (d) Both (b ... a) Pacemaker function (b) Resting potential (c) Action potential duration (d) All of the above
Description : During Phase 2 of action potential in cardiac cell, depolarizing current through calcium channels is balanced by (a) Delayed rectifier potassium current (b) outward chloride channel (c) Both (a) and (b) (d) None of the above
Description : Regarding verapamil, which one of the following statements is false? (a) Angina pectoris is an important indication for the use of verapamil (b) Contraindicated in the asthmatic patient (c) ... phase of the action potential in AV nodal cells (e) Used in management of supraventricular tachycardias
Last Answer : Ans: B