How do lipids move through the body so they can be digested and absorbed?

Question

If you have ever poured oil into a glass of water, you have seen that these two substances do not mix. Knowing this, how do lipids move through the body so they can be digested and absorbed? How are lipids stored in the body? Explain your answer.

Answer 1

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Answer 2

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Answer 3

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Answer 4

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Answer 5

Fat does not dissolve in water, the fat molecules enter the duodenum in a large mass, which makes it impossible for the pancreatic lipase enzymes to attack them. Lipase is a water soluble enzyme and can only attack the surface of the fat molecules. Bile is produced in the liver and stored in the gallbladder, which enters the duodenum via the bile duct. Bile disperses fat into small droplets which then become suspended in the water of the digestive tract. This is called emulsification - allows lipase to gain easier access to the fat molecules and thus accelerates their breakdown and digestion.

Fat digestion and absorption Into The Bloodstream - Lipase and other digestive juices break down the fat molecules into fatty acids and types of glycerol. Absorption of fat into the body, takes 10-15 minutes. It occurs in the villi - finger-like projections which cover the small intestine.

Inside each villus is a series of lymph vessels (lacteals) and blood vessels (capillaries). The lacteals absorb the fatty acids and glycerol into the lymphatic system which eventually drains into the bloodstream. The fatty acids are transported via the bloodstream to the adipose cells or muscle cells, where they are stored or oxidized for energy