Question

what is vena cava ?explain

Answer 1

Vena cava is a vein which carries deoxygenated blood to heart

Answer 2

Vena cava is one of the main blood vessels, they are veins.
There are two vena cava - one is superior other is inferior
Inferior vena cava carries the deoxygenated blood from the lower parts of the body to the heart.
The Superior vena cava carries the deoxygenated blood from the upper parts of the body to the heart.