What is meant by sinoatrial node??
Answers
Answer:
SAN is present on the upper left corner of left atria.
Explanation:
It is also known as pacemaker .
It is autoexcitable and produce the effect for the starting of heartbeat.
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Sinoatrial node is a specialized cluster of cells in the heart that initiates the heartbeat.
It's known as the heart's natural pacemaker.
The electrical impulses are generated there. The SA node is also called the sinus node.
The electrical signal generated by the SA node moves from cell to cell down through the heart until it reaches the atrioventricular node (AV node), a cluster of cells situated in the center of the heart between the atria and ventricles.
The AV node serves as a gate that slows the electrical current before the signal is permitted to pass down through to the ventricles.
This delay ensures that the atria have a chance to fully contract before the ventricles are stimulated. After passing the AV node, the electrical current travels to the ventricles along special fibers embedded in the walls of the lower part of the heart.
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