Question

What is the SA Node (Sinoatrial node)?

1) A node in the heart that initiates the electrical impulses for the heartbeat.
2) A node in the brain that controls the heart rate.
3) A node in the lungs that regulates the oxygen levels in the blood.
4) A node in the stomach that aids in digestion.

Answer 1

The SA Node, or Sinoatrial node, is a specialized clump of myocardial conducting cells located in the right atrium of the heart. It initiates the electrical impulses that regulate the heartbeat, making it the pacemaker of the heart.

Step-by-step explanation:

The SA Node, or Sinoatrial node, is a specialized clump of myocardial conducting cells located in the right atrium of the heart. It initiates the electrical impulses that regulate the heartbeat, making it the pacemaker of the heart.