Cardiac Cycle

Question 1

Atrial systole

Answer 1

Blood from the body and heart flow into both atria simultaneously

Atria contract inducing high pressure in Atria forcing blood into the ventricles via av valves

Question 2

Ventricular systole

Answer 2

Ventricles fill with blood simultaneously
Ventricles contract increasing pressure causing av valves to snap shut and forcing blood into the pulmonary artery and aorta

Question 3

Cardiac systole

Answer 3

Bothe atria and ventricles relax and high pressure in aorta and pulmonary artery cause semi lunar valves to shut preventing back flow into the atria