Question

In which blood vessel is glucose concentration likely to vary the most?

Answer 1

The hepatic portal vessel/vein return the blood with absorbed nutrients from the small intestine (blood capillaries of the villi) to the liver.  

Not the hepatic vein, the hepatic vein functions as the blood vessels that drain de-oxygenated blood from the liver and blood cleaned by the liver (from the stomach, pancreas, small intestine and colon) into the inferior vena cava.

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