Question

The other name of main vein is
A. Renal vein
B. Pulmonary vein
C. Vena cava
D. Aorta

Answer 1

Hint: The circulatory system is also known as the cardiovascular system. It helps in the circulation of blood throughout the body, thereby helping in the transport of nutrients, respiratory gases, and hormones.

Complete answer:
The components of a human cardiovascular system include the heart, blood, and blood vessels. Blood is the fluid component and consists of the blood cells and plasma. The blood vessels can be of three main types, namely the arteries, veins, and capillaries. Arteries are involved in the transport of oxygenated blood. The aorta is the largest artery. Veins are involved in the transport of deoxygenated blood. The main vein in the human circulatory system is known as the Vena Cava. Veins that drain the upper part of the body are known as the superior vena cava, while the vein draining the lower part is known as the inferior vena cava. Heart is the main organ that helps in pumping blood. It receives deoxygenated blood from different body organs through the veins, which is then transferred to the lungs for oxygenation. The oxygenated blood is transported back to the left side of the heart. This oxygenated blood is then carried to all body parts through arteries.

Note: Human circulatory system has two different pathways known as the pulmonary circulation and the systemic circulation. The pulmonary circulation includes the short loop starting from the heart to the lungs and then back to the heart. On the other hand, the systemic circulation carries blood from various organs of the body to the heart and vice versa.