Question

Which parts of the heart pumps deoxygenated blood to the lungs?

A. 1, 2 and 6
B. 1, 2 and 7
C. 2, 4 and 6
D. 3, 4 and 5
E. 3, 4 and 8

Answer 1

Hint: The human heart is divided into four chambers (two atria and two ventricles). The heart acts as the complex muscular pump which circulates blood throughout the body. The atria receives blood and the ventricles pump the blood out. The heart pumps out oxygenated blood to the body and pumps out deoxygenated blood to the lungs.

Complete answer:
The right atrium (1) receives deoxygenated blood from the body via superior and inferior vena cava (7) and sends it to the right ventricle (2) which pumps out this deoxygenated blood via pulmonary artery (6) to the lungs, where this deoxygenated blood is converted to oxygenated blood.
The left atrium (3) receives oxygenated blood from the lungs via pulmonary vein (8) and sends it to the left ventricle (4) which pumps out this oxygenated blood via the largest artery in the human body aorta (5) to the body, where this oxygenated blood is utilized by the body and converted to the deoxygenated blood.
Thus the circulation of the blood in the human heart is considered as double circulation as it passes the blood from the heart twice: once as oxygenated blood and once as deoxygenated blood.
Thus the heart pumps deoxygenated blood to the lungs via right atrium (1), right ventricle (2) and pulmonary artery (6).
The heart comprises its own circulatory system which supplies blood to the heart muscles and is called as the coronary circulation. The circulation of the oxygenated blood to the parts of the body is called the systemic circulation. The circulation of the deoxygenated blood to the lungs is called the pulmonary circulation.

Hence, the correct answer is option (A).

Note: The heart pumps deoxygenated blood to the lungs via right atrium (1), right ventricle (2) and pulmonary artery (6) and oxygenated blood to the body via left atrium (3), left ventricle (4) and aorta (5). The heart is composed of three layers including the outer layer (epicardium), the middle layer (myocardium) and the inner layer (endocardium).