Question

multiple choice question
what happens after the ventricles of the heart complete their contraction?
the atria immediately begin contraction.
all four chambers of the heart relax for a brief interval.
all four chambers of the heart contract for a brief interval.

Explanation:

The cardiac cycle has a sequence. After ventricular contraction (systole), all four chambers of the heart relax briefly (diastole) to fill with blood before the next cycle. The atria do not immediately contract after ventricular contraction. And all - four - chamber contraction simultaneously is not the normal sequence after ventricular contraction.

Answer:

All four chambers of the heart relax for a brief interval.