1.

Assertion[A]: Atria and ventricles do not contract at the same time.Reason[R]: This time delay allows proper filling of all the 4 chambers of the heart and results in an efficient pumping of blood.

Answer»

Assertion[A]: Atria and ventricles do not contract at the same time.



Reason[R]: This time delay allows proper filling of all the 4 chambers of the heart and results in an efficient pumping of blood.





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