Receptor in SA node – MCQ – Answer
Under resting conditions, activity of which of the following receptors predominate in the SA node? – Correct Answer: d) Muscarinic M2
Under resting state, vagal activity through cholinergic muscarinic M2 receptors predominate in the SA node and AV node. During exercise and febrile states, sympathetic activity increases.
Sympathetic beta 1 receptors are positive inotropic and chronotropic, while beta 2 receptors are located predominantly in the vascular smooth muscle and mediate vasodilatation.
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