The cardiac cycle refers to the sequence of events that takes place from one heart beat to the next. A full understanding of the cardiac cycle requires thorough examination of atrial systole, atrial diastole, ventricular systole, ventricular diastole, atrial and ventricular volume changes during the cycle, electrical events (depolarization and repolarization) of atria and ventricular myocytes, heart sounds associated with turbulent blood flow caused by the closure of semilunar valves, as well as hydrostatic blood pressure changes within the atria, ventricles, and the aorta. Test you basic understanding of the cardiac cycle by taking this simple quiz.
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(1) During ventricular systole of the cardiac cycle, the period of time immediately after the start of ventricular contraction when the atrioventricular valves close (when ventricular pressure exceeds atrial pressure) until just before the opening of the semilunar valves is referred to as the __________ __________ period. Your response should contain two words.
(2) During ventricular diastole of the cardiac cycle, the period of time immediately after the closure of the semilunar valves until just before the opening of the atrioventricular valves is referred to as the __________ __________ period. Your response should contain two words.
(3) In a typical human cardiac cycle, the volume of blood in the left ventricle just before the start of ventricular systole is approximately __________. This volume if referred to as the end-diastolic volume.
(4) In a typical human cardiac cycle, the volume of blood remaining in the left ventricle at the end of ventricular systole is approximately __________. This is referred to as the end-systolic volume.
(5) In a healthy 70-kg adult man, stroke volume is about __________.
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Posted: Friday, March 18, 2016
Last updated: Tuesday, March 11, 2025
Last updated: Tuesday, March 11, 2025
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