What is systole?

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Study for the AAMI Certified Associate in Biomedical Technology Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

What is systole?

Explanation:
Systole is the contraction phase of the heartbeat when the ventricles shorten and push blood out into the aorta and pulmonary artery. As the ventricles contract, the atrioventricular valves close to prevent backflow (producing the first heart sound), and once the pressure is high enough, the semilunar valves open to eject the blood. In contrast, the relaxation phase (diastole) is when the chambers fill with blood, and the interval between beats is the overall cardiac cycle rather than a single phase. The heart sounds relate to valve closures that occur at transitions between phases, with S1 marking the start of systole and S2 marking its end.

Systole is the contraction phase of the heartbeat when the ventricles shorten and push blood out into the aorta and pulmonary artery. As the ventricles contract, the atrioventricular valves close to prevent backflow (producing the first heart sound), and once the pressure is high enough, the semilunar valves open to eject the blood. In contrast, the relaxation phase (diastole) is when the chambers fill with blood, and the interval between beats is the overall cardiac cycle rather than a single phase. The heart sounds relate to valve closures that occur at transitions between phases, with S1 marking the start of systole and S2 marking its end.

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