When the pressure inside the ventricle causes the atrioventricular valve to close and the semilunar valve to open, which statement about the heart is true?

The cardiac term that refers to the volume of blood remaining in a ventricle after contraction is

(a) end diastolic volume,

(b) end systolic volume,

(c) stroke volume,

(d) cardiac reserve.

For the atrioventricular valves to be open, the pressure in the ventricles must be:

What event immediately follows the closure of the atrioventricular valves and coincides with the onset of ventricular systole?

During which following phase (or phases) of the cardiac cycle is the blood volume in the ventricles constant?

If the pressure in the ventricles is higher than in the atria, which of the following statements must be true?

I. The atrioventricular valves are closed.

II. The semilunar valves are open. 

III. The ventricles are in systole.