Question

Which among the following is the largest vein human body?
a) Renal vein
b) Pulmonary vein
c) Superior vena cava
d) Aorta

Answer 1

Hint: The blood vessels that carry blood towards the heart are called veins. Most of the veins carry deoxygenated blood from various tissues back to the heart. There are different types of veins inside the body.

Complete answer:
The vena cavae are large veins that bring the deoxygenated blood from the body to the heart.
In humans, they are of two kinds: Superior vena cava and Inferior vena cava.
The superior vena cava is the superior of the two vena cava that return the deoxygenated blood from the systemic circulation to the right atrium of the heart. The diameter of the superior vena cava is 24 mm. These short length veins that receive venous blood return from the upper half of the body, above the diaphragm. Superior vena cava is the largest vein in the human body.
The inferior vena cava is also a large vein that contains the deoxygenated blood from the lower and middle body into the right atrium of the heart.

Additional information:
The renal veins drain blood into the kidney. These veins connect the kidney to the inferior vena cava. One vein originates from each kidney that divides into four divisions upon reaching the kidney. The anterior branch receives blood from the anterior part of the kidney whereas the posterior branch receives blood from the posterior part.
Pulmonary veins are the type of veins that carry oxygenated blood to the heart from the lungs, The largest pulmonary veins are the four main pulmonary veins, two coming out from each lung that drains the blood into the left atrium of the heart.
Aorta is the main artery in the human body that originates from the left ventricle of the heart. It extends down to the abdomen where it divides into two small arteries. Aorta distributes oxygenated blood to all parts of the body through the systemic circulation.

So, the correct answer is c) Superior vena cava.

Note:
The largest vein in the human body is the superior vena cava. Although the inferior vena cava also has a greater diameter, it isn’t the largest vein.
Aorta is the largest artery in the human body.