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Question

What is the significance of time gap in the passage of impulse from sino-atrial node to the ventricle?


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Solution

SA node:

  1. A band of muscles or a myocardial structure that is present near the opening of the vena cava at the corner of the right auricle is known as the Sino-Atrial node (SA node).
  2. It generates impulses that stimulate contraction for the initiation of a heartbeat.

Significance of time gap:

  1. There is a time gap between the passage of impulse from the SA node to the ventricles of the heart.
  2. This provides time for the ventricles to relax.
  3. During this time, blood pressure is low and the semilunar valves that prevent the reverse flow of blood into the ventricles close.

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