Process of Digestion

Human digestive systemClass XIProcess of DigestionThe Process of Digestion is accomplished by mechanical and Chemical process in different parts of the alimentary canal. Alimentary canal consists of 1. Buccal Cavity2. Oesophagus3. Stomach4. Small Intestine5.Large Intestine

Digestion in the Buccal Cavity30% of the Starch is hydrolyzed by salivary amylase/Ptyalin at a pH of 6.8 into maltose. Pharynx & OesophagusNo digestion take place in Pharynx & Oesophagus. Act as a Cannel through which the food passes into the stomach.

Digestion in the StomachThe gastric juice is a mixture of mucus, hydrochloric acid and protein digesting enzymes. (Pepsinogen and Pro-renin)Protien Proteoses and Peptones Digestion in the Small IntestineDuodenum receives biles, pancreatic juice and the intestinal juice.Bile salts helps in the immlusification of fats and activate lipases.Pancreatic juice contains Trypsinogens, Chymotrysinogen Procarboxypeptides, Amylase Lipase and Nucleases.

ProteinTrypsinShorter polypeptidesPeptonesProteoses Chymotrysin

Shorter carboxypeptidases dipeptidespolypeptides aminopeptidases

Dipeptides dipeptidases AminoacidsLipids Lipases Diglycerides +(Triglycerides) Fattyacids

Diglycerids Lipases Monoglycerides + Fattyacids

Monoglycerides Lipases Fattyacids + Glycerol

QUESTIONS FOR SLOW LEARNER

1. What do you mean by digestion?

2.Name the enzyme present in human saliva. What is its pH?

3.In which part of alimentary canal, no digestion takes place?

QUESTIONS FOR AVERAGE LEARNER

1.What is the role of liver, gall bladder and pancreas in the digestion process ?2. Why acidic environment in the stomach is needed for food digestion?3. Which emzyme is requierd to digest milk proteins in the stomach of infants ?

QUESTIONS FOR BRIGHT LEARNER

1. In human, starch digestion starts in Buccal cavity but stops in the stomach. Why?2. Why are villi present in ileum and not in the stomach ?