collect information on changes taking place in the food during the process of digestion.( From the school library or internet and display your observation on the bulletin board).
Answers
Answer:
Digestive system
Explanation:
digestion is a process on which complex food materials are break down into simple substances by using digestive juices and enzymes.
the digestion in humans Start from our mouth.
when we eat food the teeth which is present in our mouth the food is get crushed and mixed with saliva which is present in salivery gland in our mouth with the help of tongue the food is mixed and pushed into oesophagus or food pipe.In this oesophagus mucous membrane is present and relaxation and contraction takes place called peristalsis. carbohydrates are digested in our mouth.due to this peristalsis movement the food is pushed to cardiac stomach and then stomach. stomach contains gastric glands. Gastric glands secrete HCl and enzymes. with the help of HCl the food is break down and the proteins of food lost their structure. mocous protect stomach from the action of HCl. here proteins and fats are digested.in this acid medium the enzyme Pepsin starts digestion of proteins. Pepsin is active only in the presence of HCl. HCl converts inactive pepsizone to active pepsi zone. after this through duodonem and pyrolic sprinter the small small quantities of food is passed to small intestine. it is the main part of digestive system here maximum absorption takes place with the help of fingers like projections called villi. villi increases surface area so that absorption will be easy.liver secrete bile juices and pancreas secrete pancreatic juices with the help of these the enzyme trpsin starts digestion of proteins and fats and carbohydrates.after that the waste or undigested food is passed through the large intestine and through rectum finally comes out from anus