Question

: The post-caval vein collects blood from
A. Hind limbs
B. Hind limbs and organs of the body cavity
C. Body cavity organs
D. Renal organs

Answer 1

Hint:- Post-caval vein is a large vein that drains the venous blood (deoxygenated) from the body to the heart. It is formed by joining two common iliac veins (left and right iliac veins) at the fifth lumbar vertebral level. It is also known as Inferior vena cava and is represented by IVC.

Complete step-by-step solution:- Post-caval vein is the lower vena cava (inferior). The left and right iliac veins join at the abdomen on the fifth vertebral level. After joining, they pass through the thoracic diaphragm at eighth vertebral level.
Post-caval vein collects the deoxygenated blood from the lower portion of the body i.e. legs (hind limbs), kidney, abdomen and other organs. It runs down the vertebral column (right side). After collecting the deoxygenated blood, it goes through a small intra-thoracic route and then finally drains into the heart through the right atrium. So the correct option is (B) Hind limbs and organs of the body cavity.

Additional Information: The development of the post-caval vein is a very complex embryological process with many veins coming from different parts. The post-caval vein is separated from the right atrium by a valve known as an Eustachian valve, during the embryological stage.

Note:- Opposite to post-caval vein, precaval vein (superior vena cava) collects deoxygenated blood from the upper body i.e. forelimbs and other organs, and carries it to the right atrium of the heart. Along with coronary sinus, which carries blood from muscles and drains it to the heart, these veins form the venae cavae. Any damage or shock to the vena cava can lead to excessive non-stop bleeding that could be life-threatening.