Question

SA node is called the pacemaker of the heart because

• A. It conducts the impulse from the AV node
• B. It generates the cardiac impulse
• C. It is present in the right atrium
• D. It is made up of specialized muscle fibers

Answer 1

The correct option is B

It generates the cardiac impulse

The correct answer is B:

SA (Sinoatrial node):

1. It is a group of cells that are located in the wall of the right atrium.
2. It is also known as a pacemaker because it helps in the generation of cardiac impulses.
3. The originated cardiac impulse spreads like a wave of contraction in the heart.