Small and Large Intestine Flashcards
mucosal surface of small intestine
has folds, villi, microvilli, crypts/glands, absorbs nutrients, water and electrolytes
mucosal surface of large intestine
has folds, microvilli, crypts/glands, absorbs water, electrolytes
propulsive movements
move contents towards rectum
what do coloncolonic, gastrocoli, and duodenocoli reflex do
start propulsive movement
what are the 4 key features of defectation reflex
intrinsic, parasympathetic, additional afferent signal, desired defecation
intrisic feature of defection
mediated by ENS
peristalitic wave that is relatively weak
parasympathetic feature of defection
greater contracility than intristic
addition afferent signals of defecation
recruiting more muscles from abdomen
pelvic floor relaxes and pulls the anal ring outward
what are 3 anatomical features tha tgive small intestines its larger SA
circular folds, villi, microvilli
positive regulation of brunner’s gland
chyme, ENS, CCK, secretin
negative regulation of brunner’s gland
sympathetic
cells of brunenr’s galnd
epithelial
secretions of brunner’s gland
mucus, bicarb
postive regulation of crypts of lieberkun and villi
chyme, ENS, CCK, secertin
negative regulation of crypts of lieverkin and villi
sympathetic
cells of crypts of lieerkun and villi
goblet, secretory, enterocytes, absorptive enterocytes
what doe goblet cells secrete
mucus
what do secretory cells secrete
water
what do enterocytes secret
electrolytes
what do absoptive enterocytes secrete
expression of peptidases, sucrase, maltase, lactase, lipase
what is peristalisis stimulated by
Ach
what is peristalis inhibited by
VIP, NO
what affects growth of intestinal microbiotic
salvia, acid, fluid/electrolytes, bile
mucosal immunity
intestinal immunity
pharm
what are functions of interstinal microbiota
conversion of primary to secondary bile acids
deconjuation of compounds conjugated in liver
nutrient salvage
detox
suppression of pathogenic organism
