The cardiac cycle consists of a distinct relaxation and...

The cardiac cycle consists of a distinct relaxation and contraction phase. Which term is typically used to refer
ventricular contraction while no blood is being ejected?
a. systole
b. diastole
C. quiescent
d. isovolumic contraction

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Key Concepts

Cardiac Cycle

The cardiac cycle is the sequence of mechanical and electrical events that occur during each heartbeat, including the phases of contraction and relaxation. It ensures the efficient pumping of blood throughout the body by coordinating the filling and emptying of the heart’s chambers.

Systole

Systole refers to the phase of the cardiac cycle during which the heart muscle contracts. This contraction is responsible for ejecting blood from the chambers to the circulation, although in some brief periods within systole, no blood is ejected despite muscle contraction.

Diastole

Diastole is the phase in the cardiac cycle when the heart muscle relaxes. During this period, the chambers of the heart fill with blood, preparing for the next contraction and ensuring continuous blood flow through the circulatory system.

Isovolumic Contraction

Isovolumic contraction is a specific period at the beginning of systole during which the ventricles contract but no blood is ejected because the pressure has not yet exceeded the arterial pressure required to open the semilunar valves. This phase is characterized by a rapid increase in intraventricular pressure while the volume of blood within the ventricles remains constant.

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