lecture 1 Flashcards
Saliva purpose
protect teeth from erosion by bacterial acids
mucus and digestive enzymes
saliva
t/f alpha amylase is only made in saliva
F
lot made in pancreas
t/f lower stomach can accomodate lot of food stuff
and can relax a lot
F
upper stomach
tf upper stomach accomodates lot of food and makes hcl to make a pH of 2
T
90%;80%
ingested food mat; ingested fluid both ingested in SI
ingested fluid ;ingested food mat both ingested in SI
ingested food mat. in SI; ingested fluid in LI.
residual food material(fluid electrolytes)
ingested in LI
cellulose
ex of residual food undigested food
t/f in a given day ingested fluid is more than sec. saliva in a given day
F
saliva(1500 ml)
water(1200 mL indested/day)
tf most fluid and electrolytes ingested are absorbed by SI
T
tf 500 ml escapes into colon and most go into feces
f
70% is reabs
tf renal system involved in retaining fluid
T
lubricate and form protective film along surface of GI tract; protect from enzyme and acids
mucus cells
end cells
exocrine glands
mucus cells
not sufficient of high reg motility in GI tract
stretch act
intrinsic neural control
ext. neural control
stretch act.
amplifies and coordinates stretch act in GI smooth muscle
instrinsic neural control(ME)
hormones
pacemakers
instrinsic neural control(ME)
t/f intrinsic neural control has extrinsic innerv. thru vagus nerve
T
tf hormones play major role in SM GI tract contractility
F neural control most impotant control for GI tract
which of following isnt a inhibitory NT of myenteric plexur inh. neuron
VIP
ATP
No
ACH
Ach
propels food forward and hogenizes it to some extents
stretch act(alt contraction of circular and long muscles)
intrinsic neural control
ext. neural control
stretch act(alt contraction of circular and long muscles)
tf my. plexus is int to GI
T
tf LES is open when u swallow or have peristaltic activity
F
— —- are needed to swallow
tactile sensation
tf LES and UES are normally higher than atmospheric pressure
T
LES is coord by —-
myenteric plexus
TF Vagus neurons release ACH and innerv bothexc. and inh. myen. plexus nerves
T
originate in fibroblast cells called interstitial cells of hall
pacemaker cells
which way is not how you get slow wave reachthreshold so that you produce AP spikes
strecth act
stim of myen plaxus nerve
hormone
stim of mye plexus on vagus
stim of mye plexus on vagus
basic electrical rhythym
rhythmic change in membrane potential produced by pacemaker cells
tf AP generated by the slow potentials are variable and control force of peristaltic activity
T
tf
slow rhtyms start in esophogus and extend down to antrum of stomach
F
esophogus–> nill small wave rhythym
pacemaker motilitiy goes from antrum to end of gI tract
which os the following motilities isnt controlled by
peristalisis
esoph.
antrum of stomach
SI
SI–> controlled by segmenetation type contraction
rhytmic anular or ring like contraction
seg. type contraction in SI
T/F
pacemakers of SI are coupled to pacemakers of stomach
F
arent
T/f
pacemakes in SI osscilate slower than pacemaker of stomach
F faster
TF NET FORce in Proximal SI > Distal SI
T
NET forces drive food forward
amt of time contacting is greatest in
prox SI
middle SI
Distal SI
Prox SI
long lived anular segmentatin type contraction
colon
SI
Stomach
Colon
(have haustrations)
