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.
C
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