NEET Zoology Heart & Circulation MCQ Question
Which of the following statements about the heart and its circulation are correct?
The right atrium receives deoxygenated blood and sends it to the right ventricle.
The left ventricle has thinner walls than the right ventricle due to lower pressure.
The electrical activity of the heart is primarily initiated by the atrio-ventricular node.
The pulmonary circulation involves the transportation of oxygenated blood from the lungs to the left atrium.
Correct Answer
Detailed Explanation
The right atrium indeed receives deoxygenated blood and sends it to the right ventricle for pulmonary circulation. The left ventricle has thicker walls to pump oxygenated blood to the body, and the sino-atrial node initiates the heartbeat, not the atrio-ventricular node. The pulmonary circulation carries deoxygenated blood to the lungs, not oxygenated blood to the left atrium.
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