Digestive Anatomy and Physiology Flashcards
What is the alimentary canal?
the tubular passage that extends from mouth to anus and functions in digestion and absorption of food and elimination of residual waste
What are the three mechanisms of digestion?
- Mechanical action
- Chemical action
- Enzymatic action
What is the gastrointestinal anatomy of the pig
- Mouth
- Esophagus
- Stomach
- Duodenum
- Ileum
- Jejunum
- Cecum
- Colon
- Rectum
What is retention time of digesta for pig? For chickens?
Pigs: 12-48 hrs
Chickens: 3-6 hrs
What is the gastrointestinal anatomy of the chicken?
- Beak
- Crop
- Proventriculus (stomach)
- Gizzard
- Duodenum
- Ileum
- Jejunum
- Ceca
- Colon
- Cloaca
Mouth function
a. mastication
b. produces saliva
c. adds moisture, mucus, and salivary amylase
Esophagus
peristalsis contractions
Pancreas function
Exocrine: secretes bicarbonate, lipases, amylase, nucleases, trypsinogen, chymotrypsinogen, procarboxypeptidase
Endocrine: secretes insulin and glucagon
Liver function
produces bile and bile salts
Gallbladder function
stores and secretes bile
Stomach function
a. secretes HCl
b. secretes pepsinogen
c. some mechanical digestion
Duodenum function
liver and pancreatic secretions enter here through the common bile duct
Jejunum function
does most absorption of nutrients
Ileum function
some absorption
Cecum function
microbial fermentation