Explain the process of digestion in Human being..
Answers
Mouth
The mouth is the beginning of the digestive tract. In fact, digestion starts here as soon as you take the first bite of a meal. Chewing breaks the food into pieces that are more easily digested, while saliva mixes with food to begin the process of breaking it down into a form your body can absorb and use.
Also called the pharynx, the throat is the next destination for food you've eaten. From here, food travels to the esophagus or swallowing tube.
Esophagus
The esophagus is a muscular tube extending from the pharynx to the stomach. By means of a series of contractions, called peristalsis, the esophagus delivers food to the stomach. Just before the connection to the stomach there is a "zone of high pressure," called the lower esophageal sphincter; this is a "valve" meant to keep food from passing backwards into the esophagus.
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The stomach is a sac-like organ with strong muscular walls. In addition to holding the food, it's also a mixer and grinder. The stomach secretes acid and powerful enzymes that continue the process of breaking down the food. When it leaves the stomach, food is the consistency of a liquid or paste. From there the food moves to the small intestine.
Made up of three segments, the duodenum, jejunum, and ileum, the small intestine is a long tube loosely coiled in the abdomen (spread out, it would be more than 20 feet long). The small intestine continues the process of breaking down food by using enzymes released by the pancreasand bile from the liver. Bile is a compound that aids in the digestion of fat and eliminates waste products from the blood. Peristalsis (contractions) is also at work in this organ, moving food through and mixing it up with digestive secretions. The duodenum is largely responsible for continuing the process of breaking down food, with the jejunum and ileum being mainly responsible for the absorption of nutrients into the bloodstream.
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■ 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.