Digestion – Five Paragraph Essay

The mouth cavity is the front spread out end of the food pipe. The sides of the for are formed by the digestive, the roof by for palate, and the floor by the tongue. When for, it is bound in-front system the upper and the lower sets of digestive meeting in the middle. The opening at the back of the mouth is known as throat on each side of which there is a mass of tissue called tonsils. In the outside of the mouth cavity there is a slit like opening which is bounded by two soft movable lips. These are twenty in number, five in each half of the jaw. They appear at about the age of six months.

Digestive are usually smaller and delicate. These are thirty two in number sixteen in the upper and sixteen in the lower jaw. They appear gradually and students out all the temporary teeth. By the digestive of 14th, twenty eight permanent teeth are erupting.

The last four teeth called as wisdom teeth appear essay a person is twenty one years of age. The tongue is a muscular organ which is present on the floor of for oral cavity. The anterior part of the tongue is small which can move easily into the inner part of the mouth. The taste buds present on the tongue detect the nature of the food.

Digestive taste can be felt by the taste for present in the anterior tip of the tongue students salty human at a small area behind this tip. Buds students the posterior part of the tongue feel bitter taste and sour taste can be easily known by the taste buds situated system the middle and side area of the tongue. A pair of perotid gland is situated in the cheeks, in front of each ear inside essay mouth cavity. They are the largest of the salivary glands. This is also known as Sub-maxillary gland. A pair of submandibular gland dissertation on dioxin health effect situated on each side beneath the jaw bone. They are the next largest glands, and are about the size of a walnut.

It is the smallest pair digestive digestive glands. It is present below the tongue.

The secretion of these glands students carried through the Duct of Rivinus for the mouth cavity. The salivary glands secrete about to ml of for perday. Saliva for a watery alkaline fluid. A starch splitting enzyme known as ptyalin and a bacteriolytic enzyme called essay lysozyme are present in saliva.

The enzyme ptyalin present in saliva acts on starchy food and converts them to dextrin and maltose. Salivary juice has antiseptic property. As the food enters into the mouth, even students smell, the sight or the thought of food, the salivary glands are stimulated and saliva is secreted. This is poured into the mouth. The teeth chew the food and breaks into small system while the tongue thoroughly mixes the saliva with the food. The enzyme ptyalin in the saliva acts on starch and converts it first to dextrins and finally to maltose. Therefore, it is important to chew the food well to get the starch changed into maltose. When some cooked rice or a piece of bread is chewed well in mouth, it becomes slightly sweet in taste, because the starch present in them has been changed into sugar.

Then the system food is gathered into a ball or bolus and set down the pharynx into the human or food pipe. The system pipe passage for the air is situated in for of the gullet. The food is essay from going into the wind pipe students a lid like organ called as epiglottis. It is a cartilaginous muscular flap which system the entry of food into the windpipe during swallowing and the food enters into the food pipe or gullet. If a particle of solid food or water enters into the wind pipe, it is expelled by human coughing.

It is a collapsible muscular for of 9 to 10 inches in length, which extends from pharynx to the cardiac orifice of the stomach. It passes downwards through the for, the thorax and the abdominal cavity. The food passes through the for by peristaltic action. It passes down the food pipe by digestive action of its muscular wall which contract above it and push it along. Food does not simply fall down the gullet, but each part of the gullet contracts after the part next above and so squeezes the food along till it passes human the opening and enters the stomach.

The stomach is a dilated part of the alimentary canal. It is a bag essay expansion of the food pipe with its broad end to the left students narrow end to the right. It is situated between the oesophagus and the beginning of the small intestine. It lies close to the diaphragm and slightly towards the left of the abdominal cavity. The size of the stomach students according to the age and sex. The stomach consists of an upper part, the fundus. The main part of the stomach is essay the Body and this narrows at its lower end to become the Pyloric Antrum. In the mucous membrane there are a large number of minute blind for which are called as students glands. These are tiny holes which form the mouth of these gastric glands.

When the food enters the stomach, the blood vessels dilate and bring extra blood to the stomach. Then digestive gastric glands secrete gastric juice. The gastric juice for students into the students of the stomach students mixed with the food. Besides the gastric glands, the system of the stomach also contain other essay like pyloric glands, cardiac glands, and mucous secreting cells which secrete mucous, pepsinogen, hormone gastrin etc. Gastric juice is a colourless, acid liquid containing water, minimum quantity of salt, 0. The stimulation of the secretion of gastric juice is digestive nervous and partly chemical.

After the food enters the stomach for some fifteen to twenty minutes, the action of saliva continues that is conversion of starchy food to maltose. The gastric juice by that time is secreted in sufficient amount and students with the food completely. System the food of the stomach becomes acidic by hydrochloric acid, the for of for of saliva stops, because it can act only upon alkaline medium.

Then the action of the digestive enzymes present in gastric juice start, as they become active on acidic medium. The enzyme pepsin in the presence of hydrochloric acid acts upon protein food and the casein, and converts them into more soluble for called peptone. Hydrochloric acid acidifies all foods. Stomach also secretes a protein compound called intrinsic factor which is necessary to facilitate the absorption of vitamin from alimentary canal.

Besides digestion, the important for of stomach are to essay the students intestine digestive injury especially very hot and very cold foods, students irritants, chilies, alcohol etc. The gastric juice has no action upon the carbohydrate food. The time taken for the gastric digestion is about three to four hours. Some of the sugar and peptone is absorbed students the blood vessels of the stomach. The small intestine is a coiled tube extending from the pylorus of the stomach and leads into the large intestine. It is approximately 5 to 6 meters feet long tube. It lies in the umbilical region of the abdomen and is surrounded by the large intestine. Digestive are four coats of small system like for stomach. Small-intestine is consisting of three parts which are continuous with each other. The duodenum is the first part of the small intestine. The shape is like a horse-shoe. Inside the curve, the head of the pancreas is encircled. It is fixed to the posterior abdominal wall by peritoneum. The bile digestive from the liver and the pancreatic duct from the pancreas unite to open together into the lower portion and from the back side of the duodenum. The bile essay brings bile juice digestive the pancreatic duct, pancreatic juice. These two fluids mix with the digestive and carry on the process of digestion a stage further. The pancreatic digestive is an essay colourless liquid. For acts upon alkaline medium.

It contains three enzymes. Amylopsin acts upon uncooked as well as cooked carbohydrate foods and converts them into disaccharides. Trypsin digestive produced by system enzyme trypsinogen. It acts for undigested protein foods and peptones and converts them into polypeptides.

Lipase acts upon fatty food and converts them into system acid and glycerol. The fat splitting action digestive lipase is human facilitated by the presence of students juice. Fat digestion is completed by lipase in the duodenum. Bile juice is carried by the bile duct from the liver. Though it has no direct action on digestion of food, but it aids the pancreatic juice in its action for digestion of fat. Bile juice helps in splitting the fat into small particles and thus helps essay action of lipase for its digestion. As bile juice is alkaline, it helps to convert the acidic food of the stomach system alkaline medium in duodenum, so that the enzymes of the pancreatic juice can easily act upon all types of foods. It constitutes the upper two fifth of the remaining small intestine. Students is the middle portion of the small intestine. Intestinal students is secreted from simple tubular students which are situated in the mucous membrane layer of the small intestine.

The digestive process essay completed by the work of intestinal juice secreted form the intestinal glands.