Question

Which is the largest vein in the human body?

Answer 1

Veins are those who carry deoxygenated blood from the body to the heart. Two large veins are present in the human body superior and inferior Vena cava. Vena Cava is the largest vein that brings the deoxygenated blood from the body into the heart.

Complete answer:
Blood vessels are part of the cardiovascular system that transport blood throughout the human body. Veins are the blood vessels that carry deoxygenated blood toward the heart.
Veins carry deoxygenated blood but there are few exceptions like four Pulmonary veins.
Largest vein in the body is the vena cava and is divided into superior Vena cava and inferior Vena cava.
The Superior vena cava carries the deoxygenated blood from the upper body directly to the right Atrium of the heart while the inferior Vena cava carries deoxygenated blood from the lower body directly to the right Atrium.
The superior Vena cava carries blood from the brain and arms into the top of the right Atrium while the inferior Vena cava pumps the blood from the legs and abdominal cavity into the bottom of the right Atrium. Vena cava are also called the Central veins.

Note:
Veins carry deoxygenated blood from the body into the heart. small small venules become progressively larger vessels and they are called veins and the largest vein in the human body is in vena cava i.e. superior and inferior vena cava. These largest veins that return the deoxygenated blood into the right upper chamber of the heart that is the right Atrium.