Question

Choose the correct answer from the alternatives given. Which of the following blood vessels carries oxygen-poor blood from the heart to lungs?
A. Pulmonary vein
B. Pulmonary artery
C. Carotid artery
D. Aorta

Answer 1

Hint: In human blood circulation is of a close type so it starts from the right ventricular region and ends here also through the pulmonary circulation. So we have to identify the part which carries less amount of oxygenated blood followed by human double circulation .So pulmonary circulation is the most important part of the human double circulation.

Complete answer:
Systemic heart:
left part of the heart ( i.e. left atrium and left ventricle) contain the blood which is to be pumped into the systemic circulation, The main purpose of such circulation is to transport oxygen, as well as nutrients to the body tissues, and to remove Co2 and other harmful nitrogenous waste from them.

Pulmonary heart:
The right part of the heart ( i.e. right atrium and right ventricle) contain the blood which is to be pumped in pulmonary circulation for oxygenation, it is called pulmonary heart. The pulmonary circulation is responsible for regular oxygenation of the impure deoxygenated blood which is received by the right auricle from lungs.
The oxygenated blood is supplied to the heart muscle for its consumption with the help of two coronary arteries, left and right. These arteries arise from the only one common origin at the arch of the aorta. The left and right Coronary arteries then further subdivided into several branches called sub arteries and veins carrying blood to different regions of the heart. The deoxygenated blood from heart walls returns through the coronary vein which drains into the coronary sinus. The coronary sinus opens into the right atrium.
Hence there is less amount of oxygenated blood passed through the pulmonary artery.

Hence, the correct answer is option (B).

Note: It is known to everyone that vein has carried almost oxygenated blood. but poorly oxygenated blood is carried out by the pulmonary artery. Aorta is the part of the lungs which always carries oxygenated blood. Carotid artery also carries oxygenated blood. So pulmonary artery is the correct option which is given above.