Table

Stages in Digestion

Part of the Alimentary Canal Gland and its secretion Enzyme secreted Substrate Product of Digestion
Mouth Salivary gland : Saliva Salivary amylase (Ptyalin) Starch Maltose
Oesophagus None None None None
Stomach Glands lining the stomatch : Gastric juice and hydrochloric acid. Pepsin in adults Renin is children Proteins, Coagulation of milk proteins (Caseinogen) Proteases and Peptones Casein
Duodenum Liver : Bile juice None Fats
  • Emulsified fat
  • Provides an alkaline medium for the action of intenstinal juices
Pancrease : Pancreatic Juice
  • Amylopsin
  • Trypsin
  • Steapsin (lipase)
  • Strach
  • Proteins peptones, peptides
  • Amino acids Fats
  • Maltose and glucose Proteases
  • Fatty acids and glycerol
Ileum Glands lining the ileum : Intenstinal juice. Erepsin (Peptidase) Maltase Sucrase (invertase) Lactase Proteins and peptides Maltose Sucrose Lactose Amino acids Glucose and Fructose Glucose and galactose
Colon None None None Absorbs water and mineral salts forming feaces
Rectum None None None Temporarily stores undigested food before egestion
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