colon Flashcards
herbivores are what type of fermenters
hindgut
-aka post gastric fermenters
Cecotropes
Cecotropes are nutrient-rich droppings produced by animals like rabbits and guinea pigs, which they reingest to maximize nutrient absorption.
cecum
def and function
microbial fermentation in hind gut fermenters
-microbes breakdown things animals cannot and makes things animal can use for energy
Ileocecal Valve:
main [urpose
dont want the microbes to leave and enter ileum
between ileum and colon
open-
-stimulated by gastrin
large intestin contains 2 things
main funciton
colon and rectum
water and ion absorbtion
waste sotage
Taeniae coli of the colon
large Bands of longitudinal
muscle that run the length of the colon
- makes 3 saculations?
is the passage rate slow or fast in colon
slow
Haustral contractions
def and what sets pace
similar to segmentation contractions but less frequent
cells of cajal/BER
modulated by ENS and CNS
true. false
colon has peristalsis contractions
true
-similar to MMC in Sm int
some species have anti-peristalsis contraction. def?
- for species that use the cecum more, birds. move backwards to go back in to the cecum. reverse peristalsis
whats mass movement peristalsis?
type of peristalsis that rapidly drives contents to rectum for storge
Gastrocolic reflex
what is it
gastroileal reflex
Food in the stomach triggers mass movement in the colon. needs to move out of colon to make room for new coming from SI
-stimulated by gastrin and parasymp.
- Moves contents from ileum into colon
Defecation Reflex
what is it
triggered by stretch receptors
if ready to poop, internal and external anal sphincter relaxes
if voluntary- EXTERNAL relaxes
occurs involuntary under stress
secretions in colon
NO digestive enzymes
DOES secrete:
-mucous
-buffers
absorbtion of colon:
big or little SA?
2 things that are absorbed
little SA- bc its smooth
no transport proteins
na, water, some bile salts
-most absored in si
absorbtion:
Na is reabsorbed bc being actively pumped out
-water follows [ ]
;)
4 essential nutrients dog and cat
taurine
arginine
Vit A
arachidonic acid
-cats cant use fructose
def each
crop
gizzard
proventriculus
chickens have very short x bs the x absorbs the water
crop- storage (part of the esophagus)
gizzard- mechanical stomach
proventriculus- glandular stomach
short colon bc the cecum
