Avian digestive tract
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Avian Digestive Tract. Ruminates. DIGESTIVE TRACT. CONNECTIONS. Salivary Glands. SALIVA. Secreted by epithelial cells of three glands Contains AMYLASE (starch hydrolyzing) and LYSOZYME (antibacterial) Used for lubrication, cooling, solvent and buffer Sialorrhea = excess production.

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Avian Digestive Tract

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Avian digestive tract

Avian Digestive Tract


Ruminates

Ruminates


Digestive tract

DIGESTIVE TRACT


Connections

CONNECTIONS


Salivary glands

Salivary Glands


Saliva

SALIVA

  • Secreted by epithelial cells of three glands

  • Contains AMYLASE (starch hydrolyzing) and LYSOZYME (antibacterial)

  • Used for lubrication, cooling, solvent and buffer

  • Sialorrhea = excess production


Esophagus peristalsis

Esophagus & Peristalsis


Stomach

STOMACH

  • Initial site of protein hydrolysis/digestion

  • Primary site of mechanical digestion via rumination

  • Absorption of water and alcohol


Stomach secretions

STOMACH SECRETIONS

  • Site of initial protein hydrolysis

  • Controlled by multiple factors including sight, smell, taste of food as well as distention of fundus

  • HCl provides optimal pH for enzymes like Pepsin


Duodenum

DUODENUM

  • First section of small intestine

  • Drastic rise in pH due to addition of bile salts

  • Receives secretions of pancreas

  • Most common site of ulcers (5cm from pylorus)


Bile salts

BILE SALTS

  • Inorganic salts produced by liver

  • Used to emulsify (increase surface area) of lipids/fats

  • Stored temporarily in Gall Bladder

  • Enters Duodenum via Common Bile Duct


Pancreatic juice

PANCREATIC JUICE

  • Contains Trypsin (protein hydrolyzing), Lipase (lipid hydrolyzing), Nuclease (DNA-RNA hydrolyzing) and Amylase (carbohydrate hydrolyzing)

  • pH must be Alkaline (8) so pancreas secretes bicarbonate(NaHC03)


Small intestine

SMALL INTESTINE

  • Jejunum (8ft)

  • Ileum (12ft)

  • Site of absorption and chemical digestion


Intestinal juice

INTESTINAL JUICE

  • Contains aminopeptidase(protein hydrolyzing), sucrase, maltase and lactase (carbohydrate hydrolyzing)

  • High surface area of small intestine (200 m2) assists in secretion and absorption


Villi

VILLI

  • Small (1mm) projections of small intestine that drastically increase surface area of small intestine

  • Cells lining villi die and are consumed!

  • Contain capillaries for transport of material

  • Contain lacteals to transport fats


Vermiform appendix

Vermiform Appendix


Colon

COLON


Colon1

COLON

  • Involved in synthesis of Vitamin K

    • Assists clotting

    • Assists conversion of glucose to glycogen in the liver


Colonoscopy

COLONOSCOPY


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