alleryOne complete cardiac cycle lasts about 0.8 second. Within this cycle, the contraction of the ventricles (ventricular systole) takes approximately how long?
A0.1 second
B0.3 second
C0.4 second
D0.8 second
Answer & Solution
Correct answer: B. 0.3 second
1. One cardiac cycle of about 0.8 second has three events.
2. Atrial systole (auricle contraction) lasts 0.1 second.
3. Ventricular systole (ventricle contraction) lasts 0.3 second.
4. Ventricular diastole (ventricle relaxation) lasts 0.4 second.
5. Option A (0.1 s) is the atrial value, a trap for the ventricular one.
6. Option C (0.4 s) is the diastole value, and option D (0.8 s) is the whole cycle.
7. The ventricular contraction itself takes 0.3 second, option B.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 14 Transportation in Plants and Circulation in Animals "Cardiac Cycle", p.217_
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