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Cardiac Cycle Overview

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Questions and Answers

What occurs during atrial systole?

Atria contract and pump blood into the ventricles. (correct)

Ventricles contract and pump blood to the body.

AV valves are closed while semilunar valves are open.

Ventricles are relaxed and fill with blood from the atria.

What is the primary function of the semilunar valves during ventricular systole?

Prevent backflow of blood into the atria.

Allow blood to flow from ventricles to the body. (correct)

Facilitate the passive flow of blood into the ventricles.

Close to create pressure in the ventricles.

What occurs during the diastole phase of the cardiac cycle?

AV valves are closed while semilunar valves are also closed.

There is a brief period of relaxation allowing blood to fill the chambers. (correct)

Blood is actively pumped from the ventricles.

Both atria and ventricles contract simultaneously.

How can you define systole in the context of heart function?

<p>The contraction of heart muscle to pump blood out.</p> Signup and view all the answers

Which statement describes a feature of ventricular systole?

<p>Blood is pumped from the ventricles into the body's circulatory system.</p> Signup and view all the answers

Study Notes

Cardiac Cycle Stages

Systole: Heart muscle contracts, forcing blood out of heart chambers.
Diastole: Heart muscle relaxes, allowing chambers to fill with blood.
Atrial and Ventricular Coordination: Atrial and ventricular activities are synchronized; atrial systole equals ventricular systole.

Three Stages of Cardiac Cycle: Atrial Systole

Atria Contract: Atria pump blood into ventricles.
AV Valves Open: AV valves open, allowing blood flow.
Ventricles Relaxed: Ventricles are relaxed during atrial contraction.

Three Stages of Cardiac Cycle: Ventricular Systole

Ventricles Contract: Ventricles contract, forcing AV valves closed.
Semilunar Valves Open: Semilunar valves open, allowing blood to pump into pulmonary artery and aorta.
Blood Pumped: Blood is pumped to the pulmonary artery and aorta.

Three Stages of Cardiac Cycle: Diastole

Relaxation: Both atria and ventricles relax briefly.
Blood Flow to Atria: Blood flows into atria; some blood passively enters ventricles.
Filling Period: Diastole is a period of filling the heart chambers.

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Description

Explore the stages of the cardiac cycle, including systole and diastole, as well as the coordination between atrial and ventricular contractions. Understand how the heart functions during each phase to efficiently pump blood throughout the body.