Human digestive system essay

Digestion in Small Intestine: Most of the digested food having been absorbed in small intestine, a semifluid mass is left to pass into large intestine. Movements are essential for the process of Defecation. The onward movement of the food is affected by means of waves of contraction of the intestines called peristalsis.

The enzyme ptyaline of saliva hydrolyzes starch into maltose and dextrins. Bile has no digestive enzyme, so it does not take part directly in digestion.

From the mouth the food goes to the stomach. By the action of various digestive juices, saliva, gastric, juice, pancreatic juice and intestinal juice, different food materials are simplified and ready for absorption.

The mucous membrane of the small intestine is line by a number of projections like substances known as villi. Sodium bicarbonate neutralises the acid and makes the chummed food called chyme, alkaline; glycocholate and taurocholate of sodium break down the fats of tissues into small globules which mixes with water to form an emulsion.

One of the greatest functions of large intestine is its capacity to move. Most of them are disaccharides and polysaccharides. The food when comes out of the stomach is called chyme or chyle. Stationary movements are localized and do not move the foods forward. Protein digestion starts in the stomach.

Generally this movement is present in every part of Gastrointestinal tract. Mucin is secreted which helps in lubricating the faeces and facilitates their passage. Carbohydrates are composed of carbon, Hydrogen and oxygen.

Salivary juice secreted from salivary Glands in the mouth act upon Carbohydrate foods.

In the form of monosaccharides they are directly picked up by the blood from the villi. Amylase turns starch and glycogen into maltose and lipase converts fat emulsions to fatty acids and glycerol.

It converts peptone polypetide and other undigested protein foods into amino acids. Simplified proteins are absorbed by the blood vessels from the villi as amino acids and carried to the liver via the portal circulation.

Proteins have been broken down to peptone by gastric juice, polypeptide by pancreatic juice and finally to Amino acids by intestinal juice. To push the food particles forward so that different digestive juices can be mixed properly with the food in different parts of alimentary canal.

The organs responsible for digestion of our food are teeth, gullet, oesophagus, stomach, small intestine, large intestine and pancreas.

Essay on the Digestive System (For Students) | Human Physiology

Renin, Pepsin and gastric lipase. A villus contains a lacteal, blood vessels, epithelium and muscular tissue, which are connected together by lymphoid tissue. The chyme now turns into chyle and is finally taken into blood.

Propulsive peristaltic movement push the chyme along the length of the small intestine until it reaches the ileocaecal valve which opens to allow the contents of the ileum to enter into the large intestine. The digestion products are finally absorbed in the walls of small intestine and passes into blood.

The smaller units of protein are called amino acids which are composed of elements like carbon, hydrogen, oxygen and nitrogen. Absorption of digested food take place in the epithelial surface of the villi in the Ilium part of small intestine. Organs responsible for digestion: The materials ultimately thrown out are called faeces which consist of undigested and un-absorbable portions of food.

Excess of calcium, iron drugs of heavy metals are excreted from the walls of the large intestine and mix with the faeces.ADVERTISEMENTS: In this essay we will discuss about the digestive system in humans.

After reading this essay you will learn about: 1. Organs of Digestive System 2. Accessory Glands for Digestion of Foods. Essay # 1. Organs of Digestive System: Digestion means simplification of complex foods. It is the process of breaking various foodstuff into [ ]. Digestive System essaysThe digestive system is the the group of organs that changes food to carbohydrates, fats, and proteins and used by our body.

Digestion takes places begins form our mouth and ends with our anus. the function of our digestion system are to ingest food, digest into nutrients.

The human digestive system is responsible for the intake, breakdown, absorption and finally removal of nutrients and energy needed for the f.

Organs responsible for digestion: The organs responsible for digestion of our food are teeth, gullet, oesophagus, stomach, small intestine, large intestine and pancreas. Secretions for digestion: Three organs of our body, by their secretions, Contribute to the digestion.

Short essay on Human Digestive System

They are (1) stomach. The Human Digestive System Essay Words | 4 Pages. order to function have to be extracted from food and absorbed into the body. The. The Digestive System of the Human Body - The digestive system is a very important system in the human body.

It is a group of organs that work together to turn food into energy and nutrients in the entire body.

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Human digestive system essay
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