Questions: What term refers to the contraction of the heart? systole cardiac cycle stroke volume (SV) diastole

What term refers to the contraction of the heart? systole cardiac cycle stroke volume (SV) diastole
Transcript text: What term refers to the contraction of the heart? systole cardiac cycle stroke volume (SV) diastole
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Solution

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The answer is the first one: systole.

Explanation for each option:

  • Systole: This term refers to the phase of the cardiac cycle during which the heart muscle contracts and pumps blood out of the chambers. It is specifically the contraction phase of the heart.
  • Cardiac cycle: This term refers to the complete sequence of events in the heart from the beginning of one heartbeat to the beginning of the next. It includes both systole (contraction) and diastole (relaxation).
  • Stroke volume (SV): This term refers to the amount of blood ejected by the left ventricle of the heart in one contraction. It is a measure of the volume of blood pumped out, not the contraction itself.
  • Diastole: This term refers to the phase of the cardiac cycle when the heart muscle relaxes and allows the chambers to fill with blood. It is the opposite of systole.

In summary, "systole" is the correct term for the contraction of the heart.

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