The Digestive System
- Created by: Demi Yates
- Created on: 20-09-14 21:59
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- Digestive System
- Digestion is the process in which large molecules are hydrolysed by enzymes into small molecules which can be absorbed or assimilated.
- Absorption
- The taking in of food molecules.
- Assimilation
- The conversion of absorbed food into the substances of the body.
- Parts of the digestive system
- Oesophagus: Adapted for transport. Carries food from the mouth to the stomach. Thick muscular wall.
- Stomach: Muscular sack with inner layer that produces enzymes. Glands that produce enzymes and digest proteins. Mucus is produced to stop the stomach being digested.
- Small intestine: Food is further digested by enzymes. Inner walls folded into the villi, which gives it a large surface area.
- Large Intestine: Absorbs water. Food becomes drier and thicker. Faeces is formed.
- Rectum: Faeces stored here before being removed by the anus in a process called Egestion.
- Salivary Glands: Contains Amylase which breaks down starch into maltose.
- Pancreas: Produces pancreatic juice which contains proteases to digest proteins, lipase to digest lipids and amylase to digest starch.
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