During systole

Atria and ventricles contract simultaneously

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Atria and ventricles contract successively

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Only atria contract

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Only ventricles contract

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B
Atria and ventricles contract successively

Systole is the contraction of chambers of heart. During cardiac cycle upper chambers and lower chambers function as separate units. Upper chambers(atria) are in diastole (relaxation) when lower chambers(ventricles) are in systole (contraction) and vice versa.

Suggest Corrections

Similar questions

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

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

Question 18
What prevents backflow of blood inside the heart during contraction?

(a) Valves in heart
(b) Thick muscular walls of ventricles
(c) Thin walls of atria
(d) All of the above

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.

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.

Join BYJU'S Learning Program