PHYSIOLOGY
SYNAPTIC PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Atrioventricular valves:open. Semilunar valves:closed.
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Atrioventricular valves:closed. Semilunar valves:open.
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Atrioventricular valves:closed. Semilunar valves:closed.
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Atrioventricular valves:open. Semilunar valves:open.
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Detailed explanation-1: -The heart valves open and close passively because of pressure differences on either side of the valve. When pressure is greater behind the valve, the leaflets are blown open and the blood flows through the valve. However, when pressure is greater in front of the valve, the leaflets snap shut and blood flow is stopped.
Detailed explanation-2: -What is the position of heart valves when blood pressure is highest in the aorta? The valves that separates the atria from the ventricles.
Detailed explanation-3: -Answer and Explanation: The correct answer is C: The blood pressure in the aorta is the highest during the second phase of ventricular systole, the ventricular ejection phase.
Detailed explanation-4: -The closing pressure (the diastolic arterial pressure) on the left is 80 mmHg as compared to only 10 mmHg on the right. This higher closing pressure leads to earlier closure of the aortic valve. In addition, the more muscular and stiff “less compliant” left ventricle (LV) empties earlier than the right ventricle.
Detailed explanation-5: -semilunar valve, either of two pocketlike half-moon-shaped structures located between the left ventricle and the aorta (aortic valve) and between the right ventricle and the pulmonary artery (pulmonary valve) of the heart.