NEET 2023 Model Paper 2

Question : 193 of 200

Marks: +1, -0

Which one of the following statements is incorrect ?

The nodal musculature has the ability to generate action potentials without any external stimuli.
The SAN fibres can generate the maximum number of action potential and is responsible for initiating and maintaining the rhythmic contractile activity of the heart.
During a cardiac cycle, each ventricle pumps out approximately 70‌mL of blood which is called the stroke volume.
The first heart sound (lub) is associated with the closure of the semilunar valves.

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