The number of SA node and AV node in humans are

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1 and 2 respectively

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2 and 1 respectively

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Solution

The correct option is A 1
Pacemaker serves to produce rhythmic impulses for the heart beat. The sinoatrial node (SA) node serves as a pacemaker and is a small mass of specialized cardiac muscle. It is present in the posterior wall of the right atrium near the opening of superior vena cava. AV node is a specialized tissue between the atria and the ventricles of the heart, specifically in the posteroinferior region of the interatrial septum near the opening of the coronary sinus. It conducts the normal electrical impulse from the atria to the ventricles. There is a single SA and AV node present in the heart.
So, the correct answer is option A.

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