What is the primary function of the highlighted vessel? a) to bring oxygen-rich blood to the liver b) to keep the cells functioning to empty directly into the inferior vena cava so the blood can be oxygenated c) to bring oxygen-rich blood to the small intestines d) to help with absorption to bring nutrient- and toxin-rich blood to the liver for processing

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d) to help with absorption to bring nutrient- and toxin-rich blood to the liver for processing

Explanation:

The highlighted vessel in the figure below is called "hepatic portal vein" (it is highlighted by the blue color.

The main function of this vein is to supply blood rich in nutrients and oxygen (which left the heart) for the liver to perform its processing functions. About two thirds of the blood that reaches the liver comes from the functioning of the portal vein. The rest of the blood necessary for the liver to function is transferred through the hepatic artery.

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