Adrenaline directly affects on (a) SA node (b) β-cells of Langerhans (c) dorsal root of spinal nerve (d) epithelial cells of stomach.

Adrenaline directly affects on
(a) SA node
(b) β-cells of Langerhans
(c) dorsal root of spinal nerve
(d) epithelial cells of stomach.
by

1 Answer

Answer :

(a) SA node
by

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What is a Dorsal root made of?

Description : What is a Dorsal root made of?

Last Answer : Feel Free to Answer

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

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

What is SA Node ?

Description : What is SA Node ?

Last Answer : : A special type of muscle located at the top of the right atrium wall of the heart. Node No. 1 SA in Figure.

Function of SA node is

Description : Function of SA node is

Last Answer : Function of SA node is A. Muscular pain B. Contraction of lungs C. Uricotelic D. None of the above

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

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Last Answer : Ans: C

The correct route through which pulse-making impulse travels in the heart is (a) SA node → Purkinje fibres → bundle of His → AV node → heart muscles (b) SA node → AV node → bundle of His → Purkinje fibres → heart muscles(c) AV node → bundle of His → SA node → Purkinje fibres → heart muscles (d) AV node → SA node → Purkinje fibres → bundle of His → heart muscles.

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Last Answer : (b) SA node → AV node → bundle of His → Purkinje fibres → heart muscles

Rate of heart beat is determined by (a) Purkinje fibres (b) papillary muscles (c) AV node (d) SA node.

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Last Answer : (d) SA node.

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

Which of the following drugs depresses automaticity of SA node as well as ectopic foci, abbreviates action potential duration of Purkinje fibres, and slows atrioventricular conduction: A. Propranolol B. Lignocaine C. Procainamide D. Bretylium

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Last Answer : A. Propranolol

The following action of digoxin is responsible for beneficial effect in auricular fibrillation: A. Increased myocardial contractility B. Suppression of SA node C. Depression of A-V conduction D. Enhanced Purkinje fibre automaticity

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Last Answer : C. Depression of A-V conduction

The secondary pacemaker of the heart is known as the: a) AV node b) SA node c) Purkinje Bundle d) None of the above

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Last Answer : ANSWER: A -- AV node