Define digestion. Explain the process of digestion in human beings.
Answers
this is done mechanically by teeth and chemically with the help of enzymes.
■ MOUTH:-
♤ 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.