Question

Which one of the statements is correct with reference to the
circulation of blood in a mammal?

Pulmonary artery carries oxygenated blood to the lungs.

Left atrium receives oxygenated blood.

AV node is responsible for initiating and maintaining the rhythmic contractile
activity of the heart

The right and left coronary arteries arise from the arch of aorta.
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Answer 1

Answer:

correct answer is (b)

Left atrium receives oxygenated blood.

Explanation:

Left auricle receives oxygenated blood from the lungs through the pulmonary vein. It is the only vein in the human body that carries oxygenated blood.

Pulmonary artery carries deoxygenated blood to the lungs for oxygenation.

Pulmonary vein brings oxygenated blood to heart. Venous blood is returned to right auricle.

Thus, the correct answer is option B.