Question

_____ is the phase in which pressure within the chamber will fall and the blood form the aorta and the plumary trunk will begin to backflow and are caught buy the cups of the semilunar valves. when the ventricular pressure drops below atrial pressure the AV valves open and another cardiac cycle repeats as passive ventricular filling beings.

A) Atrial systole
B) Isovolumetric relaxation
C) Ventricular systole
D) Rapid ventricular ejection

Answer 1

The phase in question is called isovolumetric relaxation, where ventricular pressure falls below the pressure in the aorta and pulmonary trunk, prompting the semilunar valves to close and prevent backflow.

Step-by-step explanation:

The phase described in the question where pressure within the chamber falls and blood from the aorta and the pulmonary trunk begins to backflow, being caught by the cups of the semilunar valves, is known as isovolumetric relaxation. This occurs during the early phase of ventricular diastole. When the ventricular pressure drops below atrial pressure, the atrioventricular (AV) valves open, allowing passive ventricular filling, marking the start of another cardiac cycle.

In the early phase of ventricular diastole, the pressure within the ventricles drops, causing blood to flow back toward the heart and producing the dicrotic notch in blood pressure tracings. The semilunar valves close to prevent backflow, and the atrioventricular valves remain closed. This phase is called isovolumic ventricular relaxation phase or isovolumetric ventricular relaxation phase