GI Flashcards
Omnivore
Medium complex GI Tract
Long SI
Slow digestion ⬆️ enz breakdown
Carnivores
Simple GI Tract
Herbivore
Most complex GI Tract
- Hindgut Fermenters Horse: simple stomach, complex LI
- Foregut Fermenters Cow & sheep: large complex forestomach➡️ fermentation
Getting energy req processes
- Digestion: mechanical, GI exocrine secretions, barrier fn
- Absorption: digested food enters blood or lymph
- primarily active transport most nutrients & electrolytes
- passive lipids/VFA/SCFA
Protein digestion
Hydrolysis protein➡️ AA & di/tri-peptides➡️ blood
CHO digestion
Hydrolysis polysacc:
- Mammal enz: monosacc➡️blood
- Bact enz: VFA➡️blood
Fat digestion
Hydrolysis triglycerides➡️ micelles➡️
Glycerol + glycerides + FFA ➡️ reester triglycerides in intestines➡️ chylomicra ➡️lymph
Contraction Modes
Phasic: timed by slow wave=peristalsis
Tonic: long term contraction, sm M property = ext sphincter
SI Paracellular ion transport
Leaky TJ: move ions as
LI Paracellular ion transport
Tight TJ: NaCl conserv & water reabs
Dehydrate feces
Ephaptic conduction
⚡️Synctium myocyte sheet
Gap jt
Slow waves
Regular oscillations in Vm due to ICC
Spike potential
When depol phase of slow wave passes threshold ✅VG Ca2+ CH ✅contraction
Neuroendocrine sys can change SW
Pacemakers
Anatomical sites where SW exceeds threshold