:- ♤ FLUID CALLED SALIVA SECRETED BY THE SALIVARY GLANDS.♤ THE SALIVA CONTAINS AN ENZYME CALLED SALIVARY AMYLASE.♤ FUNCTION :- BREAK DOWN STARCH INTO COMPLEX MOLECULE TO GIVE SUGAR. HELP IN MOISTENS THE FOOD EASY FOR CHEWING AND SWALLOWING■ OESOPHAGUS:-♤ THE CANAL HAS MUSCLES THAT CONTRACT RHYTHMICALLY TO PUSH THE FOOD FORWARD & THIS MOVEMENT OF FOOD IS CALLED PERISTALTIC MOVEMENT WHICH OCCURS ALONG THE G.UT.■ STOMACH:-♤ GASTRIC GLANDS ARE PRESENT IN STOMACH.♤ IT RELEASE HYDROCHLORIC ACID (HCL).♤ FUNCTION:- KILL HARMFUL BACTERIA THAT ENTERS WITH THE FOOD.MAKES THE MEDIUM ALKALINE. ♤ PEPSIN:- THEY ARE PROTEIN DIGESTED ENZYME.♤ MUCUS:- PROTECTS THE INNER LINING OF THE STOMACH FROM THE ACTION OF HYDROCHLORIC ACID.■ SMALL INTESTINE:-♤ THE EXIT OF FOOD FROM THE STOMACH IS REGULATED BY A SPHINCTER MUSCLE.♤ IT HELPS IN DIGESTION OF CARBOHYDRATES, PROTEINS AND FATS.■ LIVER :- IT SECRETE BILE JUICE IN GALL BLADDER.♤ FUNCTION:- TURN ACIDIC MEDIUM TO ALKALINE.EMULSIFY THE ACTION OF FAT.♤ PANCREAS:- IT SECRETE PANCREATIC JUICE IT CONTAIN ENZYME LIKE:-♤ TRYPSIN :- HELPS IN BREAK DOWN OF PROTEINS.♤ LIPASE :- CONVERT FAT INTO FATTY ACID AND GLYCEROL.■ INTESTINAL JUICE:- THE WALL OF SMALL INTESTINE CONTAIN GLAND WHICH SECRETE INTESTINAL JUICE.♤ FUNCTION :- CONVERT PROTEINS TO AMINO ACIDS.♤ COMPLEX CARBOHYDRATES INTO GLUCOSE.♤ FATS INRO FATTY ACIDS AND GLYCEROL.■ VILLI:- THE INNER LINING OF THE SMALL INTESTINE HAS NUMEROUS FINGER LIKE PROJECTIONS CALLED VILLI.♤ FUNCTION:- INCREASE THE SURFACE AREA FOR ABSORPTION.THEY ARE RICHLY SUPPLIED WITH BLOOD VESSELS WHICH TAKE THE ABSORBED FOOD TO EACH AND EVERY CELL OF THE BODY ■ LARGE INTESTINE:- THE EXIT OF WASTE MATERIAL FROM THE BODY IS REGULATED BY THE ANAL SPHINCTER.