Which statement about the blood flow in the cardiac cycle is correct?
1 )
Blood flows into the aorta through the semilunar valve due to contraction of the right ventricle.
2 )
Blood flows into the left atrium through the pulmonary artery when the wall of the left atrium relaxes.
Blood flows into the right atrium through the vena cava when the wall of the right atrium relaxes.
4 )
Blood flows into the right ventricle through the semilunar valve due to contraction of the right atrium.
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