During ventricular systole, the
A) atria are contracting.
B) blood is entering the ventricles.
C) AV valves are closed.
D) pressure in the ventricles remains constant.
E) pressure in the aorta remains constant.

Question

Quizplus · Accepted Answer

During ventricular systole, the ventricles are contracting and pushing blood out into the pulmonary artery and aorta. In order to prevent backflow of blood into the atria, the AV valves close, causing the "lub" sound heard during a heartbeat. Therefore, choice C is the correct answer as all the other options are incorrect.

During Ventricular Systole, the