Question

Choose the schematic diagram which properly represents pulmonary circulation in humans.
A) $Right ventricle\xrightarrow[Blood]{Deoxygenated}Lungs\xrightarrow[Blood]{Oxygenated}Left auricle$

B) $Right ventricle\xrightarrow[Blood]{Oxygenated}Lungs\xrightarrow[Blood]{Deoxygenated}Left auricle$

C) $Left ventricle\xrightarrow[Blood]{Oxygenated}Lungs\xrightarrow[Blood]{Deoxygenated}Right ventricle$

D) $Left auricle\xrightarrow[Blood]{Oxygenated}Lungs\xrightarrow[Blood]{Deoxygenated}Right ventricle$

Answer 1

Humans have the ability of double circulation, one is known as systemic circulation and the other is known as systemic circulation.

Complete answer:
The pulmonary circulation starts from the right ventricle to the left atrium of the heart.

The pulmonary arteries and pulmonary veins are the vessels that are responsible for carrying out pulmonary circulation.
The impure deoxygenated blood from the right ventricle is carried to the lungs with the help of the pulmonary arteries. Now the impure deoxygenated blood is purified in the lungs after which this oxygenated blood is transported to the left auricle or atrium of the heart. This circulation of blood from the right ventricle to the left atrium of the heart is termed pulmonary circulation.
The deoxygenated blood that travels through pulmonary circulation is received to the right ventricle from the right atrium of the heart with the help of a valve known as the tricuspid valve.

Option A: The deoxygenated blood from the right ventricle enters the lungs, the blood is oxygenated in the lungs from there it is transferred to the left atrium, Therefore, this is the correct option.

All other options are irrelevant.

Hence, the correct answer is option (A).

Note: The circulation is not complete only after pulmonary circulation but another circulation which is totally contrary to pulmonary circulation takes place, which is known as systemic circulation where the pure and oxygenated blood is carried from the left ventricle which is supplied to entire body and the impure blood from the body is brought back to the right atrium of the heart.