What role do the chordae tendineae and papillary muscles play in the normal function of the AV valves?

검증된 단계별 안내

Understand that the atrioventricular (AV) valves, which include the tricuspid and mitral valves, prevent backflow of blood from the ventricles to the atria during ventricular contraction.

Recognize that the chordae tendineae are strong, fibrous strings attached to the edges of the AV valve leaflets and anchored to the papillary muscles located on the inner walls of the ventricles.

Know that during ventricular contraction (systole), the papillary muscles contract, which pulls on the chordae tendineae, creating tension that holds the valve leaflets in a closed position.

This tension prevents the valve leaflets from prolapsing or inverting back into the atria, ensuring a one-way flow of blood and maintaining efficient heart function.

Summarize that the chordae tendineae and papillary muscles work together to stabilize the AV valves during ventricular contraction, preventing valve regurgitation and maintaining proper cardiac circulation.

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주요 개념

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Atrioventricular (AV) Valves

The AV valves, including the mitral and tricuspid valves, regulate blood flow between the atria and ventricles. They open to allow blood to flow into the ventricles and close to prevent backflow during ventricular contraction, ensuring unidirectional blood flow.

Chordae Tendineae

Chordae tendineae are strong, fibrous cords that connect the AV valve leaflets to the papillary muscles. They prevent the valve leaflets from inverting or prolapsing into the atria during ventricular contraction, maintaining valve integrity and preventing regurgitation.

Papillary Muscles

Papillary muscles are muscular projections from the ventricular walls that anchor the chordae tendineae. During ventricular contraction, they contract simultaneously to tighten the chordae tendineae, stabilizing the AV valves and preventing valve prolapse.