The mouth is the beginning of thedigestivetract. In fact,digestionstarts here as soon as you take the first bite of a meal. Chewing breaks thefoodinto pieces that are more easilydigested, while saliva mixes withfoodto begin the process of breaking it down into a form your body can absorb and use.

In chemicaldigestion, enzymes break downfoodinto the small molecules the body can use. In the humandigestive system,foodenters the mouth and mechanicaldigestionof thefoodstarts by the action of mastication (chewing), a form of mechanicaldigestion, and the wetting contact of saliva.

Digestionis the breakdown of large insolublefoodmolecules into small water-soluble food molecules so that they can be absorbed into the wateryblood plasma. In certain organisms, these smaller substances are absorbed through thesmall intestineinto theblood stream. Digestion is a form ofcatabolismthat is often divided into two processes based on how food is broken down: mechanical and chemical digestion. The termmechanical digestionrefers to the physical breakdown of large pieces of food into smaller pieces which can subsequently be accessed bydigestive enzymes. Inchemical digestion,enzymesbreak down food into the small molecules the body can use.

In chemicaldigestion, enzymes break downfoodinto the small molecules the body can use. In the humandigestive system,foodenters the mouth and mechanicaldigestionof thefoodstarts by the action of mastication (chewing), a form of mechanicaldigestion, and the wetting contact of saliva.

In chemicaldigestion, enzymes break downfoodinto the small molecules the body can use. In the humandigestive system,foodenters the mouth and mechanicaldigestionof thefoodstarts by the action of mastication (chewing), a form of mechanicaldigestion, and the wetting contact of saliva.

The term mechanicaldigestionrefers to the physical breakdown of large pieces offoodinto smaller pieces which can subsequently be accessed bydigestiveenzymes. In chemicaldigestion, enzymes break downfoodinto the small molecules the body can use. ... Gastric juice in the stomach starts proteindigestion.

The term mechanicaldigestionrefers to the physical breakdown of large pieces offoodinto smaller pieces which can subsequently be accessed bydigestiveenzymes. In chemicaldigestion, enzymes break downfoodinto the small molecules the body can use. ... Gastric juice in the stomach starts proteindigestion.

Digestionis the breakdown of large insolublefoodmolecules into small water-soluble food molecules so that they can be absorbed into the wateryblood plasma. In certain organisms, these smaller substances are absorbed through thesmall intestineinto theblood stream. Digestion is a form ofcatabolismthat is often divided into two processes based on how food is broken down: mechanical and chemical digestion. The termmechanical digestionrefers to the physical breakdown of large pieces of food into smaller pieces which can subsequently be accessed bydigestive enzymes. Inchemical digestion,enzymesbreak down food into the small molecules the body can use.

Digestionis the breakdown of large insolublefoodmolecules into small water-solublefoodmolecules so that they can be absorbed into the watery blood plasma. In certain organisms, these smaller substances are absorbed through the small intestine into the blood stream.

Digestionis the breakdown of large insolublefoodmolecules into small water-soluble food molecules so that they can be absorbed into the wateryblood plasma. In certain organisms, these smaller substances are absorbed through thesmall intestineinto theblood stream. Digestion is a form ofcatabolismthat is often divided into two processes based on how food is broken down: mechanical and chemical digestion. The termmechanical digestionrefers to the physical breakdown of large pieces of food into smaller pieces which can subsequently be accessed bydigestive enzymes. Inchemical digestion,enzymesbreak down food into the small molecules the body can use.

The humandigestivesystem consists of thegastrointestinal tractplus the accessory organs ofdigestion(the tongue, salivary glands, pancreas, liver, and gallbladder).Digestioninvolves the breakdown offoodinto smaller and smaller components, until they can be absorbed and assimilated into the body.



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Class-XI

Biology

Asked by Sanalkumar S

Feb 5, 2015

What is digestion? Briefly explain the process of digestion.

Define digestion. Explain the process of digestion in human beings.

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Aruna kavitha Singupilla

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Sol:Digestion: Digestion is the process by which food is broken down into simple absorbable substances. Digestion of food takes place in the digestive system. Digestive system is made up of alimentary canal and associated glands.Parts of alimentary canal:The mouth, oesophagus, stomach, small intestine and large intestine form the alimentary canal. It is also known as the digestive tract.Mouth is guarded by upper lip and lower lip. The process of taking in food through mouth is called as ingestion.Buccal cavity is the inner region of the mouth. It encloses teeth and tongue.Teeth are of different types namely, incisors, canines, premolars and molars.Incisors are used for biting food.Canines are sharp and pointed and are used to pierce or tear food.Premolars and molars are the principal grinders helping to chew and grind the food.Tongue is a muscular organ attached to the floor of the buccal cavity at the back. It helps in mixing of food with saliva and swallowing it. It also helps in tasting different types of food with the help of taste buds present on it. The buccal cavity leads into pharynx.Pharynx is at the back of buccal cavity. The pharynx is the common channel for food and air. When you swallow food, a flap-like valve called the epiglottis closes the windpipe. It prevents the entry of food particles into respiratory tract.Oesophagus also called as food pipe helps in conveying the food from buccal cavity to stomach. The oesophagus is also known as the gullet. It is about 25 centimetres long. Food inside the oesophagus reaches the stomach by peristalsis movements.Stomach is the widest part of the alimentary canal. It is a J-shaped muscular organ with stomach occurs with the help of digestive juice. Digestive juice comprises of hydrochloric acid, mucous and some enzymes.Small intestine is made up of three regions namely duodenum, jejunum and ileum. Partially digested food called the chyme from the stomach is received by the duodenum. Duodenum also receives bile form the liver, enzymes from pancreas and secretes some enzymes on its own. All these substances bring about digestion of food in the intestine. The inner walls of the small intestine have millions of small finger like projections called the villi. Villi increase the surface area for digestion as well as absorption of digested food by eight times.Large intestine comprises of colon and rectum. Undigested food is sent into large intestine. Water from the food is reabsorbed to a great extent in the large intestine. Undigested waste is stored in the rectum for defecation.Anus is the opening of the alimentary canal to the exterior. This helps in the elimination of faeces by the process of egestion.Associated glands: These glands include salivary glands, gastric glands, intestinal glands, liver and pancreas.Salivary glands are present inside the buccal cavity. They secrete saliva. This saliva plays an important role in breaking down complex components like starch into simple sugars.Gastric glands present inside the stomach secrete gastric juice which helps in the digestion of food.Intestinal glands secrete various enzymes which aid in the process of digestion of food.Liver is the largest gland in our body. The liver secretes a yellowish green watery fluid called bile. It is temporarily stored in a sac called the gall bladder. Bile plays an important role in the digestion of fats. Bile is sent into duodenum through a narrow tube-like structure called the bile duct. Bile breaks the larger fat molecules into tiny droplets, thereby increasing their surface area, which helps in the digestion of fats easily.Pancreas is the mixed gland. It acts as a both endocrine and exocrine gland. The pancreas secretes the pancreatic juice that helps to digest carbohydrates, proteins and fats. The pancreatic juice converts carbohydrates into simple sugars and glucose, proteins into amino acids, and the lipids into fatty acids and glycerol.

the digestion is a process of food digested in our body to get energy then the process is firstly with using of food particle through mouth and it is breakdown very small particles and mixed with saliva to digest the starch and it enter through a pipe in in stomach and secret HCL to kill the all type of pathagenic bacteria and liver secret bile juice and then food are ends in small intestine to digest food particle and also absorb essential material and which are not essential then remove by anus

-basically the digestion of food will be start with our buccal cavity when we take bolas the break down of starch will be start.-the there is no digestion in esophagus according to class 10 NCERT science. page 100- then food went into the stomach and in stomach there were many enzymes present like HCl,pepsenogene,renine in children etc they act- digestion also held in intestine ref class 10 science NCERT. page 100.

there mout is the beginning part of human body.first the teeth crused or chewd the food after that tounge mix saliva which is secreted by salivary gland after that food passes through food pipe after that it will pass into stomach and it will be pass through the small intestine and after that lon intestine

the food goes firstly in mouth that is vocal cord and then saliva digest 30% starch in mouth and kill the bacteria present in food then it goes to oesophagus and then in stomach .In stomach there is HCl present which is created by stomach and digest it and break into small pieces and there is mucus also present in stomach which protect stomach from HCl.then it goes to pancreas which create pancreatic juice for digestion then in liver create bile juice and then in small intestine then large intestine then rectum

digestion involves The mixing of food. it's movemant through digestive tract, and the chemical breakdown of the large molecules of food into smaller molecules.

The major components of our food are carbohydrates,proteins and fats . Vitamins , and minerals are also required in small quantities. Food provides energy and organic material for growth and repair tissues. "The Biomacromolecule in food cannot be utilised by our body in their original form , since they have to be broken down and converted in to simple substance". This process of conversion of Complex food substantces to simple absorable form is called Digestion .