Question

What is the maximum number of action potential that a SAN can generate?

• A. 20-30/min
• B. 70-75/min
• C. 40-60/min
• D. 50-60/min

Answer 1

The correct option is B

70-75/min

The correct option is B.

Explanation of correct option:

1. The sinoatrial node (SA node) is located in the atrial wall at the junction of the superior caval vein and the right atrium.
2. It starts electrical impulses to induce contraction and is known as pacemakers.
3. The standard number of action potentials generated per minute by the SAN is 70-75/min.
4. When the SA nodes fail to function adequately, artificial pacemakers are inserted in the heart to control the cardiac rhythm.

Final answer: The maximum action potential generated by the sinoatrial node is 70-75/min.