human digestive system class xi
DESCRIPTION
Human digestive system Class XI. Process of Digestion. The Process of Digestion is accomplished by mechanical and Chemical process in different parts of the alimentary canal. . Alimentary canal consists of – 1. Buccal Cavity 2. Oesophagus 3. Stomach 4. Small Intestine 5.Large Intestine. - PowerPoint PPT PresentationTRANSCRIPT
Human digestive systemClass XI
Process 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 & Oesophagus1.No digestion take place in Pharynx &
Oesophagus.2. 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 Intestine1.Duodenum receives biles,
pancreatic juice and the intestinal juice.
2.Bile salts helps in the immlusification of fats and
activate lipases.3.Pancreatic juice contains –
Trypsinogens, Chymotrysinogen Procarboxypeptides, Amylase Lipase and Nucleases.
Protein Trypsin Shorter polypeptidesPeptonesProteoses Chymotrysin
Shorter carboxypeptidases dipeptidespolypeptides aminopeptidases
Dipeptides dipeptidases Aminoacids
Lipids Lipases Diglycerides +(Triglycerides) Fattyacids
Diglycerids Lipases Monoglycerides + Fattyacids
Monoglycerides Lipases Fattyacids + Glycerol
QUESTION’S FOR SLOW LEARNER
1. What do you mean by digestion?
2.Name the enzyme present in human saliva. What is it’s pH?
3.In which part of alimentary canal, no digestion takes place?
QUESTION’S 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 ?
QUESTION’S 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 ?