Question

The oxygenated blood from the lungs is brought to the heart by which of the following vascular systems?
A) Pulmonary artery
B) Pulmonary veins
C) Aorta
D) Capillaries

Answer 1

The circulatory system in humans is a closed system as the blood flows through tube-like structures known as blood vessels.
The blood vessels include arteries that carry oxygenated blood away from the heart, veins that bring the deoxygenated blood to the heart, and capillaries that connect the arteries and veins.

Complete answer:
Aorta is the major artery of the human body. It pumps oxygenated blood from the heart to the whole body by dividing it into several branches.
Other important arteries are known as the pulmonary arteries that carry deoxygenated blood from the heart to the lungs and it is then purified by removing the carbon dioxide present in it.
Superior and inferior Vena cava are the major veins that carry deoxygenated blood from the tissues to the heart and then this deoxygenated blood is carried by the pulmonary arteries from the heart to the lungs for oxygenation.
The pulmonary veins carry the oxygenated blood from the lungs to the heart.
There are a total of four pulmonary veins found in the human body.

Thus, the correct answer is option B.

Additional information:
Two pulmonary veins arise from each lung and enter into the left atrium of the heart. From here, the blood moves into the left ventricle, and the aorta transports this blood to each and every tissue of the body via smaller blood vessels.

Note:- Due to the double circulation of blood in humans, the oxygenated and deoxygenated blood do not get mixed up in the heart as there are separate chambers present for the two types of blood. Pulmonary veins form a major part of pulmonary circulation. The blockage of pulmonary veins may lead to severe clinical complications