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Which of the following accurately describes a portal system in the human body?
A vein originates from an organ and terminates in the heart.
A vein enters an organ other than the heart and branches into capillaries.
An artery terminates in an organ and restarts through the fusion of its capillaries.
Blood from the intestine is routed through the kidneys before reaching the inferior vena cava (IVC).
Answers (1)
In a portal system, a special type of vein carries blood from one organ to another without first going to the heart. Instead, it directly enters a specific organ, like the liver or hypothalamus. Inside that organ, the vein branches out into many tiny blood vessels called capillaries, forming a network. This arrangement allows the organ to perform specific tasks like filtering substances, metabolizing nutrients or regulating hormones. After these functions are carried out, the blood then continues its circulation to other parts of the body. So, in a portal system, the blood takes a detour through a secondary organ before returning to the heart.Hence, the correct answer is option 2.
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