Blood enters the heart because muscles of the

Ventricles relax

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Atria contract

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Atria relax

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Ventricles contract

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Solution

The correct option is C
Atria relax

During ventricular systole, the AV valves remain closed. The atria are now relaxed, and pressure in the atria is low, even lower than the venous pressure. As a result, blood flows into the atria from the large, attached veins.

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Similar questions

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. Blood enters the heart through the two atria and exits through the two ventricles.

P in the heart have thicker muscular walls than Q does. Also, R ensures that blood does not flow back when the atria or ventricles contract.
Identify P, Q and R.

Q. ___________ is the rhythmic contraction and relaxation of heart muscles.

Q. The rhythmic contraction and relaxation of heart muscles makes a

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Blood enters the heart because muscles of the

The correct option is C Atria relax During ventricular systole, the AV valves remain closed. The atria are now relaxed, and pressure in the atria is low, even lower than the venous pressure. As a result, blood flows into the atria from the large, attached veins.

The correct option is C
Atria relax

During ventricular systole, the AV valves remain closed. The atria are now relaxed, and pressure in the atria is low, even lower than the venous pressure. As a result, blood flows into the atria from the large, attached veins.