Lecture 1 - GIT Structure and Function Flashcards
What are the jobs of the GIT (7)
Motility
Secretion
Digestion
Absorption
Communication
Immune system
Detoxification/modification via metabolism
What is secreted by the GIT
Electrolytes, water, digestive enzymes, bile salts, acid, base
Why is GIT motility important
Mixes digesta to be maximally exposed to epithelial cells
Moves digesta down GIT with muscles
What does GIT breakdown do
Breakdown foods into simpler chemical compounds
What does GIT absorption do
Transfer nutrients to circulation
Role of GIT communication
With the nervous system, endocrine system, etc
Full? Hungry? Nauseous?
What are the major components of the GI tract
Mouth, pharynx, esophagus, forestomach (ruminants), stomach, small intestine, cecum & large intestine
What are the sections of the forestomach
Rumen, reticulum, omasum
Parts of the small intestine
Duodenum -> jejunum -> ileum
Major players of a birds GIT
Crop -> pro-ventriculus -> gizzard -> SI -> LI
How does body size affect transit time in fully mature dogs
Once GIT fully mature, transit time is similar despite size differences in breeds
The esophagus has stratified squamous intestinal arrangement… why?
Many layers because we are not trying to absorb anything, but they need to be protective
The mucosa layer contains
The epithelial cell layer
Connective tissue
Lamina propria
Muscle layer
Four different microscopic layers of the small intestine
Mucosa
Submucosa
Muscularis externa
Serosa
The muscularis externa includes what kinds of muscle.
Circular muscle, longitudinal muscle
