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Q.

Blood passing through the hepatic portal vein is rich in glucose and amino acids but not fatty acids. Which one of the following statements justifies this?

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a

Fats must be emulsified before they are digested.

b

Fatty acids and glycerol, being insoluble in water, cannot be absorbed into the blood.

c

Fatty acids are first incorporated into small droplets called micelles which are more soluble.

d

Bile activates lipases.

answer is B.

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Detailed Solution

Fatty acids and glycerol, being insoluble in water, cannot be absorbed into the blood. They are first incorporated into small droplets called micelles which move into the intestinal mucosa. They are re-formed into chylomicrons which are transported into the lymph vessels (lacteals) in the villi. These lymph vessels ultimately release the absorbed substances into the blood stream (subclavian veins). They are not transported to the liver through the hepatic portal vein.
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