Circulation and Excretion Units 3, 4, 5
Explain DIASTOLE.
When the atria or the ventricule are receiving blood from the previous venae or chamber.
Explain SYSTOLE.
When the the cardiac muscle contracts and push blook into the following chamber or artery.
Explain the two heart sounds you hear when your heart is beating.
The first sound - when the atrioventricular valves close. The second sound - when the semilunar valves close.