What Causes Semi Assignment Help: How to Answer This Question

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Original Question

1. What causes the semi-lunar valves to close? Group of answer choices Pressure in the ventricles is lower than pressure in the aorta and pulmonary artery. Pressure in the ventricles is higher than pressure in the aorta and pulmonary artery. 2, What causes the semi-lunar valves to open? Group of answer choices Pressure in the ventricles is lower than the pressure in the aorta and pulmonary artery. Pressure in the ventricles is higher than the pressure in the aorta and pulmonary artery. 3. What causes the A/V valves to open? Group of answer choices Pressure in the ventricles is lower than the pressure in the atria. Pressure in the ventricles is higher than the pressure in the atria. 4. During isovolumetric relaxation, which chambers are in diastole? Group of answer choices Only the ventricles All 4 Only the atria

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