Cardiovascular System: Cardiac Cycle
1.
a. Ventricular filling occurs during ______ ventricular ______
b. Blood flows through the ______ or ______ valves into the
ventricles.
2. During ventricular systole, what closes the AV valves?
3. During ventricular systole (the ventricular ejection phase), what opens the
semilunar valves?
4. During isovolumetric relaxation, what closes the semilunar valves?
5. During isovolumetric relaxation, what opens the AV valves?
6. During the four phases listed below, state whether the AV and semilunar valves are
open or closed:
Phase AV Valves Semilunar Valves
Ventricular filling
Isovolumetric contraction
Ventricular ejection
Isovolumetric relaxation