NEET UG BIOLOGY MCQ: BODY FLUIDS AND CIRCULATION

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What happens when the pacemaker is non-functional?

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Correct option: B

The cardiac muscles do not contract in a coordinated manner rhythmically

Option B (The cardiac muscles do not contract in a coordinated manner rhythmically) is correct because the pacemaker (SA node) is responsible for initiating and coordinating heart muscle contractions.

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In ABO blood grouping, person with blood group

{O^ - }

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60 \,\mathrm{~mL}

whereas the volume of blood at the end of ventricular diastole was

140 \,\mathrm{~mL}

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