Multiple choice

Systole causes

  1. entry of blood into lungs

  2. entry of blood into heart

  3. exit of blood from heart

  4. exit of blood from ventricles
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D Correct answer
Explanation

Systole is the period of contraction of the ventricles of the heart that occurs between the first and second heart sounds. Systole causes the ejection of blood from the ventricle into the aorta and the pulmonary trunk.

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