Atria and ventricle can contract at the same time.

False

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True

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What prevents the backflow of blood inside the heart during contraction ?
(a) thick muscular walls of ventricles
(b) valves
(c) thin walls of atria
(d) all of the above

Q. Atria and ventricle can contract at the same time.

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.

When two atria contract simultaneously and result in the blood pumping into ventricles this is called

Q. The separation of the atria and ventricles helps to:

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