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What is the significance of time gap in the passage of action potenial from sino-arti node to the ventricle ?

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This time gap (called delay) in the passage of action potential from the sino-atrial node to the A-V-node and then the ventricles to allow filling of ventricles.
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MODERN PUBLICATION-BODY FLUIDS AND CIRCULATION -Ncert file (Ncert Exemplar Question) (Very Short Answer Type Questions)
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