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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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



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




Colon1
COLON

  • Involved in synthesis of Vitamin K

    • Assists clotting

    • Assists conversion of glucose to glycogen in the liver



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