What is the purpose of atrial systole in the heart?

What is the purpose of atrial systole in the heart?
  1. To relax the atria
  2. To increase the flow of blood into the ventricles
  3. To stimulate the ventricular muscles to contract
  4. To close the semilunar valves

Solution

Atrial systole is the simultaneous contraction of both atria, which increases the flow of blood into the ventricles by about 30 percent.

Asked in: NCERT

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