Digestive System Notes BIO 240

Digestive system
Ingestion; motility;
·
secretions: mucous, enzymes, bile &


I

Digestion: mechanical, chemical;absorption: blood t



lymph; elimination *




oral
Organs: cavity, pharynx, esophagus, stomach
·




Outside cavity
Upper CN altruics: Adventitial
mucosa- serosa
Sinner lining, underlying a r unen
1
f inside
peritoneum
muscle, of lumen
f
smooth
cavity
(visceral


submucosa-
↳ vascularized, wino
plexus f -
controls secretions


muscularis -
↳ inner
-
circular

sphincters
control
layer
which
movement
I constricts



shortens
enteric
mypleINS



outer longitudinal layer Peritoneum:
-contraction shortens to be
parietal, visceral, cavity


Mixing propulsion
Blends materials ·Directional (1)
tract
·
Forwards t through
backwards
·wave-like
combines secretions Peristalsis
·
· -




contractions

, Digestive controls
Nervous
system
-ANS:
parasympathetic (promotes activity)
sympathetic (opposes activity)
-ENS:
sensory + motor in submucosal pletus (muscles)
and
myenteric pletus (mixing
+
proposion)
can
*
work alone or w/ ANS *



monitor chem
composition "Stretch-
I

I N
t
Afferent -
>



⑳ Letterment
t


⑭or
i
↓
coordinates:
PNS
*



motility, secretions,
↳ accessory organs
liver, GB, pancreas
Mechanical Digestion
Saliva: intrinsic gland
mastication
chewing ↳ Unicellular, independent
of Food, math moist

88888888. ↳
lingual lipase (inactive)
Extrinsic salivary gland
" T
-
↳ multiglandular: most
* moistens
food, salivary
saliva


S amylase (carbs), antibacterial


Simmunity
-




Parotid-
sublingual so
--
submandibular so