Beta adrenergic blockers lower intraocular tension by: A. Down regulating adenylyl cyclase in ciliary body through reduced activation of β2 adrenoceptors B. Constricting ciliary blood vessels C. Blocking adrenergic action on trabecular meshwork D. Reducing aqueous formation unrelated to beta adrenoceptor mediation

Beta adrenergic blockers lower intraocular tension by: A. Down regulating adenylyl cyclase in ciliary body through reduced activation of β2 adrenoceptors B. Constricting ciliary blood vessels C. Blocking adrenergic action on trabecular meshwork D. Reducing aqueous formation unrelated to beta adrenoceptor mediation
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A. Down regulating adenylyl cyclase in ciliary body through reduced activation of β2 adrenoceptors
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Beta adrenergic blockers lower intraocular tension by: A. Down regulating adenylyl cyclase in ciliary body through reduced activation of β2 adrenoceptors B. Constricting ciliary blood vessels C. Blocking adrenergic action on trabecular meshwork D. Reducing aqueous formation unrelated to beta adrenoceptor mediation

Description : Beta adrenergic blockers lower intraocular tension by: A. Down regulating adenylyl cyclase in ciliary body through reduced activation of β2 adrenoceptors B. Constricting ciliary blood vessels ... action on trabecular meshwork D. Reducing aqueous formation unrelated to beta adrenoceptor mediation

Last Answer : A. Down regulating adenylyl cyclase in ciliary body through reduced activation of β2 adrenoceptors

Pilocarpine reduces intraocular tension in open angle glaucoma by: A. Contracting sphincter pupillae B. Increasing tone of ciliary muscle C. Reducing aqueous formation D. Enhancing uveo-scleral outflow

Description : Pilocarpine reduces intraocular tension in open angle glaucoma by: A. Contracting sphincter pupillae B. Increasing tone of ciliary muscle C. Reducing aqueous formation D. Enhancing uveo-scleral outflow

Last Answer : B. Increasing tone of ciliary muscle

Agonistic action on which of the following adrenergic receptors located on ciliary epithelial cells reduces aqueous secretion: A. β1 receptor B. β2 receptor C. α1 receptor D. α2 receptor

Description : Agonistic action on which of the following adrenergic receptors located on ciliary epithelial cells reduces aqueous secretion: A. β1 receptor B. β2 receptor C. α1 receptor D. α2 receptor

Last Answer : D. α2 receptor

Which of the following categories of medications increases aqueous fluid outflow in the patient with glaucoma? a) Cholinergics Cholinergics increase aqueous fluid outflow by contracting the ciliary muscle, causing miosis, and opening the trabecular meshwork.

Description : Which of the following categories of medications increases aqueous fluid outflow in the patient with glaucoma? a) Cholinergics Cholinergics increase aqueous fluid outflow by contracting ... production. d) Carbonic anhydrase inhibitors Carbonic anhydrase inhibitors decrease aqueous humor production.

Last Answer : a) Cholinergics Cholinergics increase aqueous fluid outflow by contracting the ciliary muscle, causing miosis, and opening the trabecular meshwork.

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

Pilocarpine reduces intraocular tension in open angle glaucoma by: A. Contracting sphincter pupillae B. Increasing tone of ciliary muscle C. Reducing aqueous formation D. Enhancing uveo-scleral outflow

Description : Pilocarpine reduces intraocular tension in open angle glaucoma by: A. Contracting sphincter pupillae B. Increasing tone of ciliary muscle C. Reducing aqueous formation D. Enhancing uveo-scleral outflow

Last Answer : B. Increasing tone of ciliary muscle

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

Agonistic action on which of the following adrenergic receptors located on ciliary epithelial cells reduces aqueous secretion: A. β1 receptor B. β2 receptor C. α1 receptor D. α2 receptor

Description : Agonistic action on which of the following adrenergic receptors located on ciliary epithelial cells reduces aqueous secretion: A. β1 receptor B. β2 receptor C. α1 receptor D. α2 receptor

Last Answer : D. α2 receptor

The receptor transduction mechanism with the fastest time-course of response effectuation is: A. Adenylyl cyclase-cyclic AMP pathway B. Phospholipase C-IP3: DAG pathway C. Intrinsic ion channel operation D. Protein synthesis modulation

Description : The receptor transduction mechanism with the fastest time-course of response effectuation is: A. Adenylyl cyclase-cyclic AMP pathway B. Phospholipase C-IP3: DAG pathway C. Intrinsic ion channel operation D. Protein synthesis modulation

Last Answer : C. Intrinsic ion channel operation

Drugs that block the a receptor on effector cells at adrenergic nerve endings (a) Antagonize the effects of isoproterenol on the heart rate (b) Antagonize some of the effects of epinephrine on the blood pressure (c) Antagonize the effects of epinephrine on adenylyl cyclase (d) Cause mydriasis (e) Decreases blood glucose levels

Description : Drugs that block the a receptor on effector cells at adrenergic nerve endings (a) Antagonize the effects of isoproterenol on the heart rate (b) Antagonize some of the effects of epinephrine on ... the effects of epinephrine on adenylyl cyclase (d) Cause mydriasis (e) Decreases blood glucose levels

Last Answer : Ans: B

a2–adrenergic receptors are associated with following except (a) Increase in phospholipase C activity (b) Increase in potassium channel conductance (c) Decrease in calcium channel conductance (d) Increase in adenylyl cyclase activity

Description : a2–adrenergic receptors are associated with following except (a) Increase in phospholipase C activity (b) Increase in potassium channel conductance (c) Decrease in calcium channel conductance (d) Increase in adenylyl cyclase activity

Last Answer : Ans: D

Which racial difference in response to drugs has been mentioned incorrectly below: A. Africans require higher concentration of atropine to dilate pupils B. Black races are more responsive to antihypertensive action of beta blockers C. Japanese are more prone to develop SMON due to halogenated hydroxyquinolines D. Chloramphenicol induced aplastic anaemia is rare among Indians

Description : Which racial difference in response to drugs has been mentioned incorrectly below: A. Africans require higher concentration of atropine to dilate pupils B. Black races are more responsive ... SMON due to halogenated hydroxyquinolines D. Chloramphenicol induced aplastic anaemia is rare among Indians

Last Answer : B. Black races are more responsive to antihypertensive action of beta blockers

Currently, the first choice drug for open angle glaucoma is: A. Miotic eye drops B. Ocular α2 adrenergic agonists C. Ocular prostaglandin analogues D. Ocular β adrenergic blockers

Description : Currently, the first choice drug for open angle glaucoma is: A. Miotic eye drops B. Ocular α2 adrenergic agonists C. Ocular prostaglandin analogues D. Ocular β adrenergic blockers

Last Answer : D. Ocular β adrenergic blockers

The site of action of miotics for therapeutic effect in angle closure glaucoma is: A. Canal of Schlemm B. Ciliary body C. Ciliary muscle D. Sphincter pupillae muscle

Description : The site of action of miotics for therapeutic effect in angle closure glaucoma is: A. Canal of Schlemm B. Ciliary body C. Ciliary muscle D. Sphincter pupillae muscle

Last Answer : D. Sphincter pupillae muscle

The primary reason for preferring phentolamine as the α adrenergic blocker for performing diagnostic test for pheochromocytoma is: A. It produces rapid and short lasting α-adrenergic blockade B. It equally blocks α1 and α2 adrenoceptors C. It is the most potent α blocker D. It has no additional β adrenergic blocking property

Description : The primary reason for preferring phentolamine as the α adrenergic blocker for performing diagnostic test for pheochromocytoma is: A. It produces rapid and short lasting α-adrenergic blockade B. It equally ... It is the most potent α blocker D. It has no additional β adrenergic blocking property

Last Answer : A. It produces rapid and short lasting α-adrenergic blockade

The primary reason for preferring phentolamine as the α adrenergic blocker for performing diagnostic test for pheochromocytoma is: A. It produces rapid and short lasting α-adrenergic blockade B. It equally blocks α1 and α2 adrenoceptors C. It is the most potent α blocker D. It has no additional β adrenergic blocking property

Description : The primary reason for preferring phentolamine as the α adrenergic blocker for performing diagnostic test for pheochromocytoma is: A. It produces rapid and short lasting α-adrenergic blockade B. It equally ... It is the most potent α blocker D. It has no additional β adrenergic blocking property

Last Answer : A. It produces rapid and short lasting α-adrenergic blockade

The following sympathomimetic amine has agonistic action on α1 + α2 + β1 + β3 adrenoceptors, but not on β2 receptors: A. Adrenaline B. Noradrenaline C. Isoprenaline D. Phenylephrine

Description : The following sympathomimetic amine has agonistic action on α1 + α2 + β1 + β3 adrenoceptors, but not on β2 receptors: A. Adrenaline B. Noradrenaline C. Isoprenaline D. Phenylephrine

Last Answer : B. Noradrenaline

Beneficial effects of β-adrenoceptor blockers in CHF include the following except: A. Antagonism of ventricular wall stress enhancing action of sympathetic overactivity B. Antagonism of vasoconstriction due to sympathetic overactivity C. Prevention of pathological remodeling of ventricular myocardium D. Prevention of dangerous cardiac arrhythmias

Description : Beneficial effects of β-adrenoceptor blockers in CHF include the following except: A. Antagonism of ventricular wall stress enhancing action of sympathetic overactivity B. Antagonism ... Prevention of pathological remodeling of ventricular myocardium D. Prevention of dangerous cardiac arrhythmias

Last Answer : B. Antagonism of vasoconstriction due to sympathetic overactivity

Agonist induced autophosphorylation, internalization and down regulation is a distinctive feature of: A. G-protein coupled receptors B. Intrinsic ion channel containing receptors C. Tyrosine protein kinase receptors D. Receptors regulating gene expression

Description : Agonist induced autophosphorylation, internalization and down regulation is a distinctive feature of: A. G-protein coupled receptors B. Intrinsic ion channel containing receptors C. Tyrosine protein kinase receptors D. Receptors regulating gene expression

Last Answer : C. Tyrosine protein kinase receptors

Monitoring of blood levels of diuretic drugs is not practised because: A. No sensitive methods for measuring blood levels of diuretics are available B. It is easier to measure the effect of these drugs C. Response to diuretics is not related to their blood levels D. Diuretics need activation in the body

Description : Monitoring of blood levels of diuretic drugs is not practised because: A. No sensitive methods for measuring blood levels of diuretics are available B. It is easier to measure the effect of these ... Response to diuretics is not related to their blood levels D. Diuretics need activation in the body

Last Answer : B. It is easier to measure the effect of these drugs

Monitoring of blood levels of diuretic drugs is not practised because: A. No sensitive methods for measuring blood levels of diuretics are available B. It is easier to measure the effect of these drugs C. Response to diuretics is not related to their blood levels D. Diuretics need activation in the body

Description : Monitoring of blood levels of diuretic drugs is not practised because: A. No sensitive methods for measuring blood levels of diuretics are available B. It is easier to measure the effect of these ... Response to diuretics is not related to their blood levels D. Diuretics need activation in the body

Last Answer : B. It is easier to measure the effect of these drugs

n the treatment of hypertension the beta adrenergic blockers have the following advantage: A. They have minimal effect on work capacity, sleep quality and libido B. They do not cause postural hypotension C. Used alone, they have high ceiling antihypertensive efficacy D. They can be used in combination with any other antihypertensive drug

Description : n the treatment of hypertension the beta adrenergic blockers have the following advantage: A. They have minimal effect on work capacity, sleep quality and libido B. They do not cause ... high ceiling antihypertensive efficacy D. They can be used in combination with any other antihypertensive drug

Last Answer : B. They do not cause postural hypotension

Choose the correct statement about long acting calcium channel blocking drugs as antihypertensives: A. They are the most effective drugs in suppressing hypertensive left ventricular hypertrophy B. They are as effective as diuretics or β blockers in reducing cardiovascular/total mortality C. They compromise quality of life more than β blockers D. They have no beneficial effect in hypertensive/diabetic nephropath

Description : Choose the correct statement about long acting calcium channel blocking drugs as antihypertensives: A. They are the most effective drugs in suppressing hypertensive left ventricular hypertrophy B. They ... more than β blockers D. They have no beneficial effect in hypertensive/diabetic nephropath

Last Answer : B. They are as effective as diuretics or β blockers in reducing cardiovascular/total mortality

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

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

An immunologically mediated reaction to a drug producing stereotyped symptoms unrelated to its pharmacodynamic actions is: A. Hypersensitivity B. Supersensitivity C. Intolerance D. Idiosyncrasy

Description : An immunologically mediated reaction to a drug producing stereotyped symptoms unrelated to its pharmacodynamic actions is: A. Hypersensitivity B. Supersensitivity C. Intolerance D. Idiosyncrasy

Last Answer : A. Hypersensitivity

The following receptor type has 7 helical membrane spanning amino acid segments with 3 extracellular and 3 intracellular loops: A. Tyrosine protein kinase receptor B. Gene expression regulating receptor C. Intrinsic ion channel containing receptor D. G protein coupled receptor

Description : The following receptor type has 7 helical membrane spanning amino acid segments with 3 extracellular and 3 intracellular loops: A. Tyrosine protein kinase receptor B. Gene expression regulating receptor C. Intrinsic ion channel containing receptor D. G protein coupled receptor

Last Answer : D. G protein coupled receptor

The following is an α2 adrenergic agonist used as eyedrops to lower intraocular pressure: A. Brinzolamide B. Bambuterol C. Brimonidine D. Latanoprost

Description : The following is an α2 adrenergic agonist used as eyedrops to lower intraocular pressure: A. Brinzolamide B. Bambuterol C. Brimonidine D. Latanoprost

Last Answer : C. Brimonidine

The following is an α 2 adrenergic agonist used as eyedrops to lower intraocular pressure: A. Brinzolamide B. Bambuterol C. Brimonidine D. Latanoprost

Description : The following is an α 2 adrenergic agonist used as eyedrops to lower intraocular pressure: A. Brinzolamide B. Bambuterol C. Brimonidine D. Latanoprost

Last Answer : C. Brimonidine

The following receptor has an intrinsic ion channel: A. Histamine H1 receptor B. Histamine H2 receptor C. Adrenergic alfa receptor D. GABA-benzodiazepine receptor

Description : The following receptor has an intrinsic ion channel: A. Histamine H1 receptor B. Histamine H2 receptor C. Adrenergic alfa receptor D. GABA-benzodiazepine receptor

Last Answer : D. GABA-benzodiazepine receptor

The effects of topically applied anticholinesterase on the eye include: a. conjunctival hyperaemia b. raised intraocular pressure c. ciliary muscle contraction d. sphincter pupillae muscle relaxation e. retraction of the upper lids

Description : The effects of topically applied anticholinesterase on the eye include: a. conjunctival hyperaemia b. raised intraocular pressure c. ciliary muscle contraction d. sphincter pupillae muscle relaxation e. retraction of the upper lids

Last Answer : ciliary muscle contraction

Best site where intraocular lens is fitted: a. Capsular ligament b. Endosulcus c. Ciliary supported d. Capsular bag

Description : Best site where intraocular lens is fitted: a. Capsular ligament b. Endosulcus c. Ciliary supported d. Capsular bag

Last Answer : ANSWER: D

Adrenergic β1 selective blockers offer the following advantages except: A. Lower propensity to cause bronchospasm B. Less prone to produce cold hands and feet as side effect C. Withdrawal is less likely to exacerbate angina pectoris D. Less liable to impair exercise capacity

Description : Adrenergic β1 selective blockers offer the following advantages except: A. Lower propensity to cause bronchospasm B. Less prone to produce cold hands and feet as side effect C. Withdrawal is less likely to exacerbate angina pectoris D. Less liable to impair exercise capacity

Last Answer : C. Withdrawal is less likely to exacerbate angina pectoris

Adrenergic β 1 selective blockers offer the following advantages except: A. Lower propensity to cause bronchospasm B. Less prone to produce cold hands and feet as side effect C. Withdrawal is less likely to exacerbate angina pectoris D. Less liable to impair exercise capacity

Description : Adrenergic β 1 selective blockers offer the following advantages except: A. Lower propensity to cause bronchospasm B. Less prone to produce cold hands and feet as side effect C. Withdrawal is less likely to exacerbate angina pectoris D. Less liable to impair exercise capacity

Last Answer : C. Withdrawal is less likely to exacerbate angina pectoris

The mechanism by which neostigmine improves contraction of myasthenic muscle involves: A. Repetitive binding of the acetylcholine molecules to the same receptors at the muscle endplate B. Diffusion of acetylcholine released from motor nerve endings to a wider area activating neighbouring receptors C. Activation of motor end-plate receptors by neostigmine molecules themselves D. All of the above

Description : The mechanism by which neostigmine improves contraction of myasthenic muscle involves: A. Repetitive binding of the acetylcholine molecules to the same receptors at the muscle endplate B. Diffusion of ... Activation of motor end-plate receptors by neostigmine molecules themselves D. All of the above

Last Answer : D. All of the above

The following are true about tight junction: a. it forms a barrier to water b. it is found in the blood-aqueous barrier of the ciliary body c. it is found in the blood-retinal barrier at the apex of the retinal pigment epithelium d. all above

Description : The following are true about tight junction: a. it forms a barrier to water b. it is found in the blood-aqueous barrier of the ciliary body c. it is found in the blood-retinal barrier at the apex of the retinal pigment epithelium d. all above

Last Answer : all above

Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions characteristics. (a) C-Aqueous chamber-Reflects the light which does not pass through the lens. (b) D - Choroid - Its anterior part forms ciliary body. (c) A - Retina - Contains photoreceptors, i.e., rods and cones. (d) B - Blind spot-Has only a few rods and cones.

Description : Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions characteristics. (a) C-Aqueous chamber-Reflects the light which does not ... , i.e., rods and cones. (d) B - Blind spot-Has only a few rods and cones.

Last Answer : (c) A - Retina - Contains photoreceptors, i.e., rods and cones.

The characteristic feature(s) of dihydropyridine calcium channel blockers is/are: A. They have minimal negative inotropic action on the heart B. They have no effect on A-V conduction C. They do not affect the activation-inactivation kinetics of the calcium channels D. All of the above

Description : The characteristic feature(s) of dihydropyridine calcium channel blockers is/are: A. They have minimal negative inotropic action on the heart B. They have no effect on A-V conduction C. They do not affect the activation-inactivation kinetics of the calcium channels D. All of the above

Last Answer : D. All of the above

Select the longer acting ocular beta blocker: A. Timolol B. Betaxolol C. Cartiolol D. Levobunolol

Description : Select the longer acting ocular beta blocker: A. Timolol B. Betaxolol C. Cartiolol D. Levobunolol

Last Answer : D. Levobunolol

To be used as a topically applied ocular beta blocker a drug should have the following properties except: A. Strong local anaesthetic activity B. High lipophilicity C. High ocular capture D. Low systemic activity

Description : To be used as a topically applied ocular beta blocker a drug should have the following properties except: A. Strong local anaesthetic activity B. High lipophilicity C. High ocular capture D. Low systemic activity

Last Answer : A. Strong local anaesthetic activity

Phosphoinositide cascade is activated on binding of catecholamines to (A) α1-Adrenergic receptors (B) α2-Adrenergic receptors (C) β1-Adrenergic receptors (D) β2-Adrenergic receptors

Description : Phosphoinositide cascade is activated on binding of catecholamines to (A) α1-Adrenergic receptors (B) α2-Adrenergic receptors (C) β1-Adrenergic receptors (D) β2-Adrenergic receptors

Last Answer : Answer : A

Astimulatory G-protein transduces the signals from (A) α1-and β1-adrenergic receptors (B) α2-and β2-adrenergic receptors (C) α1-and α2-adrenergic receptors (D) β1-and β2-adrenergic receptors

Description : Astimulatory G-protein transduces the signals from (A) α1-and β1-adrenergic receptors (B) α2-and β2-adrenergic receptors (C) α1-and α2-adrenergic receptors (D) β1-and β2-adrenergic receptors

Last Answer : Answer : D

Dopaminergic D1 and D2 as well as adrenergic α and β1, but not β2 receptors are activated by: A. Dopamine B. Dobutamine C. Methoxamine D. Phenylephrine

Description : Dopaminergic D1 and D2 as well as adrenergic α and β1, but not β2 receptors are activated by: A. Dopamine B. Dobutamine C. Methoxamine D. Phenylephrine

Last Answer : A. Dopamine

Adrenergic β2 agonists produce muscle tremor by: A. Facilitating neuromuscular transmission B. Incomplete fusion of contractile response of individual fibres C. Enhanced firing of muscle spindles D. Both (b) and (c) are correct

Description : Adrenergic β2 agonists produce muscle tremor by: A. Facilitating neuromuscular transmission B. Incomplete fusion of contractile response of individual fibres C. Enhanced firing of muscle spindles D. Both (b) and (c) are correct

Last Answer : D. Both (b) and (c) are correct

The α2 adrenoceptors are: A. Located exclusively on the adrenergic nerve endings B. Prejunctional, postjunctional as well as extrajunctional in location C. Selectively activated by phenylephrine D. Selectively blocked by clonidine

Description : The α2 adrenoceptors are: A. Located exclusively on the adrenergic nerve endings B. Prejunctional, postjunctional as well as extrajunctional in location C. Selectively activated by phenylephrine D. Selectively blocked by clonidine

Last Answer : B. Prejunctional, postjunctional as well as extrajunctional in location

Which of the following is not the basis for subclassifying β adrenergic receptors into β1 and β2 : A. Selectivity of agonists B. Selectivity of antagonists C. Transducer pathway of response effectuation D. Organ selective location

Description : Which of the following is not the basis for subclassifying β adrenergic receptors into β1 and β2 : A. Selectivity of agonists B. Selectivity of antagonists C. Transducer pathway of response effectuation D. Organ selective location

Last Answer : C. Transducer pathway of response effectuation

Adrenergic β2 agonists produce muscle tremor by: A. Facilitating neuromuscular transmission B. Incomplete fusion of contractile response of individual fibres C. Enhanced firing of muscle spindles D. Both (b) and (c) are correct

Description : Adrenergic β2 agonists produce muscle tremor by: A. Facilitating neuromuscular transmission B. Incomplete fusion of contractile response of individual fibres C. Enhanced firing of muscle spindles D. Both (b) and (c) are correct

Last Answer : D. Both (b) and (c) are correct

The α 2 adrenoceptors are: A. Located exclusively on the adrenergic nerve endings B. Prejunctional, postjunctional as well as extrajunctional in location C. Selectively activated by phenylephrine D. Selectively blocked by clonidine

Description : The α 2 adrenoceptors are: A. Located exclusively on the adrenergic nerve endings B. Prejunctional, postjunctional as well as extrajunctional in location C. Selectively activated by phenylephrine D. Selectively blocked by clonidine

Last Answer : B. Prejunctional, postjunctional as well as extrajunctional in location

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) and (c) Ans: D 68. In heart, potassium channels determine (a) Pacemaker function (b) Resting potential (c) Action potential duration (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

Last Answer : Ans: D

Procainamide differs from quinidine in the following respect(s): A. It does not cause paradoxical tachycardia B. It has no α adrenergic blocking activity C. It has little antivagal action D. Both ‘B’ and ‘C’ are corre

Description : Procainamide differs from quinidine in the following respect(s): A. It does not cause paradoxical tachycardia B. It has no α adrenergic blocking activity C. It has little antivagal action D. Both ‘B’ and ‘C’ are corre

Last Answer : D. Both ‘B’ and ‘C’ are correct