NEET Zoology Heart & Circulation MCQ Question
Which of the following statements about the heart and circulation are correct?
The QRS complex in an ECG represents the depolarisation of the atria.
Blood flows from the left atrium to the left ventricle during atrial systole.
The heart's rhythmic activity is initiated by the sinoatrial node.
In pulmonary circulation, deoxygenated blood is pumped from the left ventricle to the lungs.
Correct Answer
Detailed Explanation
The sinoatrial node (SAN) is responsible for initiating the rhythmic contractile activity of the heart. The QRS complex represents the depolarisation of the ventricles, not the atria, and deoxygenated blood is pumped from the right ventricle to the lungs, not the left ventricle.
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