Question

A portal system is that in which:

• A. A vein begins from an organ and ends in heart.
• B. An artery breaks up in an organ & restarts by the union of its capillaries.
• C. The blood from gut is brought in to kidneys before it is poured in to heart.
• D. A vein breaks up in an organ into capillaries and restarts by their union as a new vein in the same organ.

Answer 1

The correct option is D A vein breaks up in an organ into capillaries and restarts by their union as a new vein in the same organ.

In a portal system, however, blood circulates through a second capillary bed, usually in a second organ, before returning to the heart. Thus, a portal system is a kind of detour in the pathway of venous return that can transport materials directly from one organ to another. The largest portal system in the body is the hepatic portal system, which carries blood from the abdominal organs to the liver.

So, the correct answer is option D.