Discussion
Which of the following is correct?
The term systole refers to
I. Phase of contraction of lungs.
II. Phase of relaxation of lungs.
III. Phase of relaxation of heart.
IV. Phase of contraction of heart.
Answer: D
Only statement IV is correct, so the answer is IV only.
Systole is the phase of the cardiac cycle in which the heart muscle contracts and pumps blood out of the chambers. The opposite phase, when the heart relaxes and fills with blood, is diastole.
Statements I and II wrongly link the term with the lungs, which are emptied and filled by breathing movements, not by systole. Statement III describes diastole, not systole. So every option containing I, II or III is wrong.
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