Question

Choose the correct answer from the alternatives given.
Systole refers to the contraction of:

• A. major arteries
• B. SA node
• C. atria and ventricles
• D. all of these

Answer 1

The correct option is C atria and ventricles

The systole is the rhythmic contraction of the chambers of the heart (Atria and Ventricles) and diastole is the rhythmic relaxation of the chambers of the heart. The events occurring during one heartbeat is known as the cardiac cycle. During this cycle, the auricles and the ventricles of the heart rhythmically contract and relax.

So, the correct option is 'Atria and ventricles'.