SAN stands for Sinoatrial Node, which is a specialized group of cells located in the right atrium of the heart. It acts as the natural pacemaker of the heart, generating electrical impulses that regulate the heartbeat.
Here's a breakdown of the SAN's role:
- Initiates Heartbeat: The SAN generates electrical signals spontaneously, triggering the contraction of the heart muscle.
- Controls Heart Rate: The frequency of electrical signals from the SAN determines the heart rate. Factors like physical activity, stress, and body temperature can influence the SAN's activity, leading to changes in heart rate.
- Coordinates Heart Chambers: The electrical impulses travel through the heart, ensuring coordinated contractions of the atria and ventricles.
The SAN is crucial for maintaining a normal heartbeat and ensuring efficient blood circulation throughout the body.
