A. teeth breaks food into smaller pieces. saliva moistens the food and makes it easier to swallow. the tongue rolls the food into a bolus.
B. food passes through by peristalsis from mouth to stomach.
C. muscular walls squeeze on food to make it semi-liquid. gastric juice contains protease to digest proteins.
D. absorption of water
E. contains enzymes that digest carbohydrate, fat and protein. absorb nutrients and water.
F. stores faeces
G. serves as a pathway for the movement of food from the mouth to the oesophagus.
liver produces bile. sotred in gallbladder.
insulin. regulate the blood glucose level.