Home Biology Body Fluids and Circulation Skill Builder Read the following statements carefully and …
Biology Body Fluids and Circulation Skill Builder Single Correct MCQ
Published on: August 12, 2026

Read the following statements carefully and choose how many statement are wrong.

A
Nodal musculature has the ability to generate action potential due to external stimuli.
Two
B
SAN is responsible for initiating and maintaining the rhythmic contractile activity of heart.
Three
C
Ventricular systole increase the flow of blood into the ventricles by about 30 times.
One
D
During joint diastole tricuspid and bicuspid valves are open. Four

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The correct answer is:
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Statement and are incorrect.

The SAN generates an action potential, which stimulates both the atria to undergo a simultaneous contraction of the atrial systole. This increases the flow of blood into the ventricles by about 30 per cent. The nodal musculature has the ability to generate action potentials without any external stimuli.

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