Question

A portal system is one in which

• A. A vein starts from an organ and ends up in the 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 kidney before it is poured into the post caval
• D. A vein breaks up in an organ into capillaries and restarts by their union as a new vein from 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 from the same organ

Portal circulatory systems differ from the typical circulatory route in that the blood passes through two sets of smaller vessels before returning to the heart. Blood from the first set of capillaries collects in portal vessels (sometimes called as portal veins) which then begin to branch again to supply a capillary network to a second location before entering a series of veins which will lead to the heart.

So, the correct answer is option D.