A portal system
A)includes a functional end artery that makes an arterial anastomosis.
B)is a simple circulatory system with an areriovenous anastomosis.
C)is one in which blood flows through two capillary beds before being sent back to the heart.
D)is one in which circulation to a large organ involves only one artery and one main (portal)vein.
E)is one in which multiple arteries converge on one organ or body region.

Question

Quizplus · Accepted Answer

A portal system is one in which blood flows through two capillary beds before being sent back to the heart. This type of system is found in organs such as the liver and the hypothalamus/pituitary gland, where substances need to be filtered or modified before being sent out to the rest of the body. Blood flows from the arterial system, through a capillary bed in the organ or region, into the portal vein, and then through another capillary bed before returning to the heart via the systemic circulation.

A Portal System