digestive system

• a tissue is a group of cells
• an organ is a group of tissues
• carbonhydrase eg maltose into starch is broken down by amalyse this is produced in the salivary glands, pancreas and small intestine, protease breaks down proteins into amino acids. lipases coverts lipids into fatty acids and glycerol it is produced in the small intestine an pancreas
• process of digestion: 1. food is chewed in the mouth then enzymes in the salaiva begin to digest the starch into smaller sugar molecules. 2. food then passes down the osephagus into the stomach. when in the stomach the enzymes begin the digestion of proteins the stomach also contains hydrochloric acid which helps break down food and kill pathogens. 3. The churning action of the stomach muscles turns the food into a fluid increasing the surface area for enzymes to digest
• 4. the fluid now passed into the small intestine at this point chemicals are released into the small intestine from the liver and the pancreas 5. the pancreas releases enzymes which continue the digestion of startch and protein also the digestion of lipids. 6. the liver then releases bile which helps speed up the digestion of lipids. bile also neutralises the acid released in the stomach 7. the large intestine absorbs water from undigested food to produces faeces this passes out your body through the rectum and anus
• salivary glands and pancreas release enzymwes to break down food
• the role of the digestive system is to break down down larger molecules into smaller molecules so it can be used by cells for growth repair and energy