During ventricular systole the atrioventricular valves
Correct answer: A. close, preventing blood from flowing back into the atria
- A. close, preventing blood from flowing back into the atria
- B. open fully to let blood into the ventricles
- C. dissolve under pressure
- D. contract actively like muscle
Explanation
Rising ventricular pressure lifts the flaps of the tricuspid and bicuspid valves shut, and chordae tendineae anchored to papillary muscles stop them turning inside out. Their closure is the first heart sound.
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About Human Heart
The human heart is a four chambered muscular pump that maintains double circulation through the pulmonary and systemic circuits. Questions cover atria, ventricles, valves, major blood vessels, the cardiac cycle, pressure changes, the conduction system and ECG, while distinguishing arteries and veins from the chambers that receive or eject blood.
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