33. Which valves shut during ventricular contraction? A. semilunar B. valves aortic C. AV valves

33. Which valves shut during ventricular contraction?

A. semilunar

B. valves aortic

C. AV valves

Expert Solution

33. AV valve (Atrioventricular valve)

Explanation --

Ventricular contraction is known as ventricular systole. In this phase, the ventricles filled with blood start contraction and increase the pressure within the ventricles. This pressure rapidly raises to above of atrial pressure. This results in back flow of blood toward atria. To prevent the back flow of blood , the mitral valve and tricuspid valve on left and right side of heart gets closed. These mitral and tricuspid valves are known as atrio ventricular Or AV valves located between the atria and ventricular chamber.

When the pressure inside the ventricles is too high, the blood pushes open up the semilunar valves, throwing blood out of ventricles. Thus, here in ventricular contraction semilunar valves are opened and not shut. Therefore A is not correct.

Aortic valve is the one of the semilunar valves located on left side of heart between the left ventricles and aorta. From above we learned that semilunar valves were opened and not shut in ventricular contraction.

gladiator answered 2 years ago

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