Question

which of the following occur in ventricular systole? the ventricles contract the ventricles relax the atria contract the atria relax

Explanation:

During ventricular systole, the ventricles contract to pump blood out of the heart. At the same time, the atria are in a relaxed state (atrial diastole) as they are filling with blood returning to the heart. Atrial contraction (atrial systole) occurs during ventricular diastole (when ventricles are relaxed).

Answer:

the ventricles contract, the atria relax