NEET Zoology Heart & Circulation MCQ Question
Which of the following statements about the heart and circulation are correct?
The P-wave in an ECG indicates the depolarisation of the atria leading to their contraction.
The cardiac output is the volume of blood pumped out by each ventricle per stroke.
The QRS complex in an ECG represents the depolarisation of the atria.
The left ventricle pumps deoxygenated blood to the lungs for oxygenation.
Correct Answer
Detailed Explanation
The P-wave does represent atrial depolarisation, which leads to atrial contraction. The cardiac output is actually the product of stroke volume and heart rate, while the QRS complex represents the depolarisation of the ventricles, not the atria. The left ventricle pumps oxygenated blood to the body, not deoxygenated blood.
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