Which step is part of the systole period of the cardiac cycle? • Blood fills the atria and pushes atrioventricular valves open. The heart is fully relaxed. and the atria begin to fill with blood. The ventricles contract fully, forcing the semilunar valves open and ejecting blood into the arteries. The atria contract, filling ventricles completely.
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The systole period of the cardiac cycle refers to the contraction of the heart muscles. Show more…
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