Digestive system

• A tissue is a group of cells with a similar structure and function
• An organ is a group of tissue working together for a specific function
• Organs are grouped into organ systems which work together to form organism
• During digestion, the large molecules are broken down into small molecules by enzymes . The small molecules can then be absorbed into the bloodstream
• Food is chewed in the mouth. Enzymes in saliva begin to digest the starch into smaller glucose molecules
• The food passes down the oesophagus into the stomach. in the stomach, enzymes begin the digestion of proteins
• Stomach contains hydrochloric acid which helps the enzymes to digest protein
• Churning action of stomach muscles turn to food into a fluid, increasing the surface area for enzymes to digest
• chemicals are released into the small intestines from the liver and pancreas
• Pancreas releases enzymes which continue the digestion of starch and protein & start the digestion of lipids
• Liver releases bile which helps speed up the digestion of lipids. bile also neutralised the acid released from the stomach
• The walls of the small intestines release enzymes to continue the digestion of protein and lipids
• In small intestine , the small food molecules produced by digestion are absorbed into the bloodstream bye diffusion or active transport
• water is absorbed into bloodstream in the large intestines
• in the digestive system, large food molecules are digested into smaller molecules and then the products of digestion are absorbed into the bloodstream
• Products of digestion are then used by body to build new carbohydrates, lipids and protein
• Some of glucose produced by digestion is used in respiration