During the cardiac cycle, which statement about blood flow is correct?
- ABlood flows into the aorta through the semilunar valve due to contraction of the right ventricle.
- BBlood flows into the left atrium through the pulmonary artery when the wall of the left atrium relaxes.
- CBlood flows into the right atrium through the vena cava when the wall of the right atrium relaxes.
- DBlood flows into the right ventricle through the semilunar valve due to contraction of the right atrium.