Question

A portal system is that in which begin
(A) A vein begins from an organ and ends in heart
(B) An artery breaks up in an organ and restarts by the union of its capillaries.
(C) The blood from the gut is brought into the kidneys before it is poured into the heart.
(D) A vein breaks up in an organ into capillaries and restarts by their union as a vein in the same organ.

Answer 1

Hint: The hepatic portal system is defined as the vascular system that transports blood from one organ to the other organ by the use of capillaries or by the veins. This system carries nutrients in the form of blood from the digestion to all the cells in the body for metabolization.

Complete step by step answer:
Capillaries are the small minute blood tubes that are branched from the arteries and veins which carry blood to and from all the parts of the body. This system of the body starts and ends with the capillaries. It is the part of the circulation in which the capillaries carry the blood to the different organs and return back to the heart. Hence the veins start from the organs and move towards the heart and discharge the blood there.

So, the correct answer is “Option A”.

Note:
The portal system is classified into three types as hepatic portal system, hypophyseal portal system and renal portal system. Example for the portal system is that the veins of the capillaries begin from the intestine and move towards the liver and end up there.