In the human heart, the tricuspid valve closes when
Correct answer: C. Right ventricular pressure exceeds right atrial pressure
- A. Aortic pressure exceeds ventricular pressure
- B. Left atrial pressure exceeds left ventricular pressure
- C. Right ventricular pressure exceeds right atrial pressure
- D. Pulmonary trunk pressure exceeds ventricular pressure
Explanation
The tricuspid valve is located between the right atrium and the right ventricle of the heart. It closes when the pressure in the right ventricle exceeds that in the right atrium, which occurs during ventricular contraction (systole). This prevents the backflow of blood into the right atrium. Option A refers to conditions affecting the aortic valve, Option B describes conditions for the mitral valve, and Option D pertains to the pulmonary valve, none of which are related to the tricuspid valve.
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About Cardiac Cycle and Heartbeat
The cardiac cycle describes atrial systole, ventricular systole and diastole, including pressure changes, blood movement and the opening or closing of heart valves. It also covers the conduction pathway from the sinoatrial node through the atrioventricular node, bundle of His and Purkinje fibres, and relates these events to heartbeat sounds.
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