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livestrong136 livestrong136
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Posts: 324
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10 years ago
Can absorbed fats be taken up directly by the capillaries in the small intestine? If not, what vessels are used to transport absorbed fats out of the GI tract?
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Educator
10 years ago
Most of the fat in the human diet is in the form of triacylglycerol, which consists of three fatty acids linked to glycerol. In the digestive tract, triacylglycerol is hydrolyzed by various lipase enzyme, to release free fatty acids and monoglycerides. It is this form that gets absorbed by the small intestines.

After digestion, monoglycerides and fatty acids associate with bile salts and phopholipids to form micelles. Micelles are about 200 times smaller than emulsion droplets (4-7nm versus 1µm for emulsion droplets). Micelles are necessary because they transport the poorly soluble monoglycerides and fatty acids to the surface of the enterocyte where they can be absorbed. As well, micelles contain fat soluble vitamins and cholesterol.

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