Science - Digestive System
- Created by: lulut001.316
- Created on: 19-05-17 10:43
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- The food we eat has to be broken down into other substances that our bodies can use
- This is called digestion
- Without digestion, we could not absorb food into our bodies and use it.
- Digestion happens in the digestive system, which begins at the mouth and ends at the anus.
- After we swallow, our food passes through these organs in turn:
- oesophagus or gullet
- stomach
- small intestine
- large intestine
- The liver and the pancreas play an important part in digestion
- The liver produces bile, which helps the digestion of lipids (fats and oil).
- The pancreas produces biological catalysts called digestive enzymes which speed up the digestive reactions.
- Digestion is the process by which food is broken down to be absorbed into the bloodstream and distributed around the body
- Our teeth break food down into small pieces when we chew.
- his is only a start to the process of digestion, as chewed pieces of food are still too large to be absorbed by the body.
- Enzymes are the biological catalysts needed to make this happen quickly enough to be useful.
- Enzymes are not living things. They are just special proteins that can break large molecules into small molecules.
- Different types of enzymes can break down different nutrients:
- amylase and other carbohydrase enzymes break down starch into sugar
- protease enzymes break down proteins into amino acids
- lipase enzymes break down lipids (fats and oils) into fatty acids and glycerol
- Carbohydrates are digested in the mouth, stomach and small intestine. Carbohydrase enzymes break down starch into sugars.
- Starch is digested to sugars
- Proteins are digested in the stomach and small intestine
- Protease enzymes break down proteins into amino acids.
- Starch is digested to sugars
- …
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