Home › Tamil Nadu SSLC (Class 10) › Biology › Transportation in Plants and Circulation in Animals › One complete cardiac cycle lasts about 0.8 secon…
One 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_
Related questions
The colourless fluid that drains from intercellular spaces, resembles plasma but has fewerA person with AB blood group is called a universal recipient. What feature of their plasmaAn accident victim needs urgent transfusion but their blood group is unknown. The group whIn a healthy resting adult, blood pressure is normally expressed as 120 mm/80 mm Hg. The fThe first heart sound, 'LUBB', which is of longer duration, is produced at the start of veA specialised patch of muscle in the wall of the right atrium starts each heartbeat on itsThe circulation in which oxygenated blood travels from the left ventricle to the body orgaThe valve located between the left auricle and the left ventricle has two cusps. By what n