What is a portal system?
- A$A$ vein that starts from an organ and ends in the heart.
- BAn artery that divides in an organ and reforms by the union of its capillaries.
- CBlood entering the heart after passing from the digestive tract to the kidneys.
- D$A$ vein that starts as capillaries in one organ and ends as capillaries in another organ before returning to the heart.
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