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the digestive system

LC Biology

ingestion food is taken into the alimentary canal
digestion food is broken down into smaller soluble pieces
absorption the movement of digested food from the alimentary canal into the blood system
egestion Removal of unabsorbed material as faeces
mechanical breakdown of food involves 1) teeth 2)contractions in stomach wall 3)peristalsis
peristalsis Rhythmic muscular contraction and relaxation in the wall of the alimentary canal causing the food to move along the canal
incisors job=cutting
canines job= tearing
Pre Molars and Molars job=crushing and grinding
Human dental formula 2(i2/2 C1/1 Pm 2/2 M 3/3)
oesophagus -connects pharynx to stomach -food moves down the this by peristalsis
stomach stores food for four hours
Chyme mixture of food and gastric juices formed in the stomach
functions of gastric juice -mucus -HCL -Pepsin
mucus function= lines and protects the stomach wall
HCL function= kills bacteria in food and activates pepsinogen
pepsinogen HCL coverts this to the active enzyme. this enzyme digets protein
small intestines parts duodenum jejunum ileum
duodenum function- most digestion takes place here
Created by: claireMonaghan1