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Flashcards in GI Overview Deck (11)
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1
Q

Digestive tract
Aka
Accessory organs

A

Mouth to Anus
Alimentary canal
Teeth/tongue/salivary glands/ liver/gall bladder/pancreas

2
Q

Function of the GI tract

Must have

Requires

A

supply CV system with usable nutrients

Digestion (breakdown of large non diffusible molecules into absorbable units)

Enzymes to aid/speed chemical rxns

3
Q

Molecules move via

Transport occurs by

A
simple diffusion
carrier mechanisms (facil diffusion, active transport)
4
Q

Motility
Mostly_____, except for

Secretion

A

muscular contraction of GI tract for propulsion and mixing
Involuntary, chewing/swallowing/defecation

Digestive juices secreted into lumen of GI tract and hormones

5
Q

Digestion

Absorption

A

Breakdown of stuff via chemical rxns, governed by temp/enzymes

Transport of digestion products into blood (via SI)

6
Q

Endocrince secretions

A

Gastrin, secretin, CCK, GIP, motilin

7
Q

Layered organization

Blood and lymph vasculature

A

Absorptive cells lining the lumen, with neural and muscular components below

Abundant to transport absorbed nutrients

8
Q

Mucosa has

ME contractions
Myenteric plexus

A

microvilli on membane, villi on folds to inc SA

Move food through tract, mixing food
Fibers and ganglia of both SNS and PNS

9
Q

Enteric NS

Allows for

A

site where PNS fibers synapse with PG neurons that innervate SM

Many S PG nerves synapse on neurons

Local regulation of the GI tract

10
Q

ENS coordinates

Modified bt

A

digestion, secretion, motility to optimize absorption

Info from CNS and local chemical/mechanical sensors

11
Q

Kallikrein

Bradykinin

A

causes breakdown of kininogen to bradykinin

causes local vasodilation to inc blood flow to the actively secreting gland