Select the correct answer. Which of the following correctly describes the 3rd stage of the cardiac cycle?
OA.
The ventricles contract.
OB.
The atria contract.
O c.
The ventricles are relaxed and fill with blood.
OD.
The atria relax while the ventricles contract.

Check all that occur during ventricular systole. a. the av valves open to allow blood to enter the ventricles from the atria. b. the av valves open to allow blood to enter the ventricles from the atria. c. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. d. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. e. the semilunar valves open to allow blood to flow into the large arteries. f. the semilunar valves open to allow blood to flow into the large arteries. g. the av valves close to prevent backflow of blood into the atria.