process of digestion
Answers
Explanation:
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.
The process of digestion starts from the mouth naturally, the food that we eat is needed to be crushed into small pieces and particles of the same texture hence, the teeth in our mouth crushes the food and the food mixes with the saliva which has salivary amaylase which breaks down sugars into starch this is secreted by the salivary glands. in the alimentary canal if the food has to be absorbed it needs broken down into smaller molecules. this is done with the help of biological catalysts called enzymes.it is necessary to move the food in a regulated manner along the digested tube so that it can proceed properly. The lining of the canal has muscles that contract rythmically these movements are called peristaltic this food is taken from the stomach through the oesophagus. the stomach is a large organ which expands when food enters it. the muscular walls of the stomach help in mixing the food . the stomach has gastric glands which are present in the inner lining of the stomach . These release Hydrochloric acid, a protein digesting enzyme pepsin and mucus. The hydrochloric acid creates an acidic medium that facilitates the action of enzyme pepsin. the mucus protects the inner lining of the stomach in acidic mediums. the exit of food from the stomach is regulated by the sphincter. This releases the food from the stomach in small amounts. the small intestine is the site of complete digestion both the liver and the pancreas secrete enzymes. the food coming from the stomach is acidic in nature in order to make it alkaline the the bile juices act on it so that the pancreatic enzymes can cat n the food. the bile juices from the liver also digest fats. the bile salts break fats into small globules for enzyme efficiency. The pancreas secrete pancreatic juices like trypsin for digesting proteins, lipase for emulsifying fats. the small intestine also secretes intestinal juice which finally converts the proteins into amino acids. the digested food is taken up by the walls of intestine which have finger like projection called villi which increase the surface area of absorption. the villi are richly supplied with blood vessels which absorb the food. the un-absorbed food is sent to the large intestine where the walls absorb more water and the rest is sent out through the anus.