the digestive system
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The Digestive System. Walter J. Taylor Resources Dr. Kehoe, UWRF nutrition course Images from: An Illustrated Guide to veterinary Medical Terminology 3 rd Edition. Janet Amundson Romich. The Mouth. Secretes Salivary Amylase (ptyalin) to breakdown starch, carbohydrates, and urea - PowerPoint PPT PresentationTRANSCRIPT
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The Digestive SystemWalter J. Taylor
ResourcesDr. Kehoe, UWRF nutrition course
Images from: An Illustrated Guide to veterinary Medical Terminology 3rd Edition. Janet Amundson
Romich
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The Mouth
• Secretes Salivary Amylase (ptyalin)– to breakdown starch, carbohydrates, and urea• into produce maltose and dextrins
• Secretes mucin– to lubricate food
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Crop (birds)
• Secretes Mucus– To lubricate food
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Rumen
• A chamber compartment of ruminant stomachs that host a viable environment to support microorganism growth– whose enzymes break down• Cellulose into VFAs (volatile fatty acids)• Polysaccharides and starches into microbial protein• Sugars, fats and proteins (urea) into B vitamins and
vitamin K
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Stomach (abomasum in mammals and proventriculus in birds)
• Secretes Gastric juices and acids– Enzyme: Pepsin to breakdown proteins • Into proteoses and peptones
– Enzyme: Lipase to break down fats• Into fatty acids and glycerol
• Secretes Mucus– To lubricate food and coat the stomach wall
lining from Chief cells that secrete HCl
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Gizzard (birds)
• Grinds foods into smaller pieces.• Birds consume small rocks that when in the
gizzard assist in breaking apart food as the gizzard’s muscles contract
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Nursing Animals
• Secrete gastric juices– Enzyme: rennin to breakdown milk protein
(casein)• Into paracasein
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Duodenum• Secretes pancreatic juices (from the Pancreas)– Trypsin and Chymotrypsin to breakdown proteins,
protesoses, peptones, and peptides• Into peptones, peptides, and amino acids
– Amylase to breakdown starch and dextrins• Into dextrins and maltose
– Lipase to breakdown fats• Into higher fatty acids and glycerol
– Carboxypeptidase to breakdown peptides• Into amino acids and peptides
• Secretes Bile (from the liver)– To break down fats into an Emulsion of fats
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Small Intestine• Secretes intestinal juices– Enzyme: Peptidase (erepsin) to breakdown peptides;
into amino acids and dipeptides– Enzyme: Sucrase (invertase) to breakdown sucrose;
into glucose and fructose– Enzyme: Maltase to breakdown maltose; into glucose– Enzyme: Lactase to breakdown lactose; into glucose
and galactose– Enzyme: polynucleotidase to breakdown nucleic acid;
into mononucleotides
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Large Intestine (cecum and colon)
• Enzyme: cellulase from microorganisms to breakdown cellulose; into VFA
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Cat
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Swine
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