Question

Oxygenated blood from the lungs enter the heart through
(A) Coronary vein
(B) Pulmonary vein
(C) Coronary artery
(D) Pulmonary artery

Answer 1

Hint: Oxygenated blood from the lungs enters the heart through the vessel which is known for its exception in its name. Its name is related to the lung and path which is followed by the blood.

Complete step by step answer:
The pulmonary veins are the type of veins that transfer oxygenated blood from the lungs to the heart. The largest pulmonary veins are the four main pulmonary veins, two from each lung that drains into the left atrium of the heart. The pulmonary veins are a part of the circulation.
Pulmonary veins are accountable for carrying oxygenated blood from the lungs to the left atrium of the heart.

Two main pulmonary veins emerge from each lung hilum, receiving blood from three or four bronchial veins apiece and draining into the left atrium of the heart. An inferior and superior main vein drains blood into each lung, so there are four main veins in total.
At the foundation of the lung, the right superior vein lies ahead of and a bit below the pulmonary artery; the inferior is situated at the bottom a part of the lung hilum. Behind the artery is the bronchus. The right main pulmonary veins (containing oxygenated blood) pass behind the right atrium and superior vena cava; the left ahead of the descending aorta.
So, the correct answer is ‘(B) Pulmonary vein '.

Note: Arteries are the blood vessels that carry oxygenated blood from the heart to organs and veins carry deoxygenated blood. Though the pulmonary vein carries oxygenated blood, still it is known as a vein because it carries blood to the heart.