Which of the Following is True of the Venae Cavae

Question

Which of the following is true of the venae cavae?
A) Most veins directly or indirectly drain into the venae cavae.
B) The portal vein drains into the superior vena cava.
C) The superior and inferior venae cavae merge at the portal vein.
D) The right atrium pumps blood into the superior vena cava.

Accepted Answer

The venae cavae are the two largest veins in the body and they receive blood from most of the veins in the body, either directly or indirectly. This blood then gets pumped into the right atrium of the heart. The portal vein does not drain into the superior vena cava, and the superior and inferior venae cavae do not merge at the portal vein. The right atrium receives blood from the superior vena cava but not the inferior vena cava. Therefore, option A is the correct answer.