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22 Cards in this Set

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  • Back
Under relatively higher pressure than other sections of the colon and hence more likely to develop diverticulitis
Sigmoid colon
Absence of these can be indication of range of disease conditions
Haustration
Both _______ and ________ of cecum, ascending and transverse colon take place
segmental
mass action contractions
_________ are important for mixing, exposing contents to mucosa to increase absorption
Segmental contractions
________ contractions are infrequent (3-4 times daily), occur over large segments to propel contents to rectum
Mass action
_________(local concentrations of segmental contractions) cease just before mass action contractions
Haustrations
Contractions regulated by _________(primary influence) and extrinsic autonomic nerves and gastroileal reflex
- gastrocolic reflex
COLLECTIVELY both the ______ and _______ reflexes act to push colon contents further along to make room for an incoming meal
gastroileal
gastrocolic
Colonic functions:
1) absorb water, electrolytes from chyme (1st half)
2) store fecal matter until defecation (2nd half)
sacs of bulging colon resulting from contraction of large intestine longitudinal and circular muscles
Haustrations
Fecal contents propelled through colon mostly by ________
mass movements
________ myenteric plexus signals relax anal internal sphincter
Inhibitory
alkaline and HCO3-
functions for protection and lubrication
MUCUS
CO2, methane (CH4) and hydrogen sulfide (H2S)
Source of borborygmi (growling)
INTESTINAL GAS (FLATUS)
tied to metabolism by bacterial flora population
DIGESTION
Both sodium and chloride are absorbed in _______ portion of large intestine
proximal
__________ passively diffuses across both apical (luminal) and basolateral membranes
Potassium
ingested ____ is actively transported into enterocytes, while ____ produced by bacterial metabolism is passively absorbed
K1
K2
Large intestine, in additions to storage function, uses microbes (bacterial flora) to synthesize ________ and some B vitamins
vitamin K
Chronic antibiotic administration can affect K synthesis and ability of blood _____
to clot
75% H20, 25% solid matter
Fecal composition
Rectal distension causes internal sphincter to relax by way of the _______
rectophincteric reflex