Question

Oxygenated blood occurs in
A. Pulmonary arteries
B. Right ventricle
C. Right atrium
D. Pulmonary veins

Answer 1

Hint: It plays an important role in the process of respiration by receiving the blood that is oxygenated in the alveoli (hollow air sacs) and then returned into the left atrium. Oxygen enters in blood while carbon dioxide leaves the blood and exhales out of the body.

Complete step by step answer:
Blood vessels are of two types in the circulatory system of the body i.e. arteries and veins.
Arteries are the blood vessels that carry oxygenated blood from the heart to different parts of the body. All arteries carry oxygenated blood but except pulmonary artery which carry deoxygenated blood from the heart of the right ventricle to the lungs.
Veins are the blood vessels that carry deoxygenated blood from different parts of the body and then supply it to the heart. All veins carry deoxygenated blood except the pulmonary veins. Pulmonary veins carry oxygenated blood from the lungs that are filled by hollow air sacs called alveoli to the left atrium of the heart.
Pulmonary veins are the part of pulmonary circulation which carry oxygenated blood back to heart. It opposes veins which carry deoxygenated blood and are the part of systemic circulation.

Thus, the correct answer is option D. i.e., Pulmonary veins.

Note:
The circulation of the blood between the lungs and the heart is known as pulmonary circulation. On the other hand, systemic circulation is the circulation of the blood between the heart and other parts of the body.