What is diastole?

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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 diastole?

Explanation:
Diastole is the relaxation phase of the heartbeat, when the heart muscle relaxes after contracting and the ventricles fill with blood before the next beat. It follows systole, the contraction that ejects blood. The second heart sound (S2) occurs at the end of systole when the semilunar valves close, not during diastole. The electrical impulse refers to the heart’s electrical activity that coordinates beats, not the mechanical state of relaxation. So diastole = relaxation.

Diastole is the relaxation phase of the heartbeat, when the heart muscle relaxes after contracting and the ventricles fill with blood before the next beat. It follows systole, the contraction that ejects blood. The second heart sound (S2) occurs at the end of systole when the semilunar valves close, not during diastole. The electrical impulse refers to the heart’s electrical activity that coordinates beats, not the mechanical state of relaxation. So diastole = relaxation.

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