LEC 15 BIOL 431
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1
What are the 2 primary division of the digestive system?
1. Alimentary canal
2. accessory organs - teeth, tongue, glands, liver, gallbladder, pancreas
2. accessory organs - teeth, tongue, glands, liver, gallbladder, pancreas
2
What are the 5 functions of the digestive system?
Ingestion
propulsion
digestion
absorption
defacation
propulsion
digestion
absorption
defacation
3
What are the 2 forms of purpolsion in digestive system?
swallowing
peristalsis
peristalsis
4
Whatis the peritoneal membrane?
it supports organs
supports naval
most are 2 layers
supports naval
most are 2 layers
5
What are the 5 parts of the mesenatry ?
VENTRAL - falciform ligament
DORSAL - lesser omentum, greater omentum, transverse mesocyclone, mesenatry proper
DORSAL - lesser omentum, greater omentum, transverse mesocyclone, mesenatry proper
6
What is retroperitoneal ?
When the organ is not completely wrapped within the peritoneal membrane.
7
What are the 4 basic layers of the alimentary canal?
Mucosa
Submucosa
Muscularis
Serosa
Submucosa
Muscularis
Serosa
8
What is epithelium type of the mucosa and what is its functions?
A. nonkeratinized - found in mouth, pharynx, esophagus, anal canal
=provides protection
B. simple columnar found in stomach and intestine
= absorption and secretion
=provides protection
B. simple columnar found in stomach and intestine
= absorption and secretion
9
In mucosa there are 3 laters, if epithelium is one what are the other 2? and their functions?
1. lamina propria - contains MALT, lymphocytes, macrophages
= defends against bacteria
2.. Musculairs mucosa -
=contracts causing folds in mucosa
= defends against bacteria
2.. Musculairs mucosa -
=contracts causing folds in mucosa
10
What is the Submucosa layer of the alimentary canal?
Binds mucosa to muscularis
Contains meisners plexus
contrails secretory cells of GI tracts
Contains meisners plexus
contrails secretory cells of GI tracts
11
What is Meitner plexus?
What regulates movement of mucosa and vasoconstriction of blood vessels
12
What is the muscularis layer of the alimentary canal?
=voluntary movement of swallowing
contains Auberbachs plexus
contains Auberbachs plexus
13
What is the function fo the Auerbachs plexus?
Controls motility of GI tract
14
What is the serosa layer of alimentary canal?
Viceral layer of peritneum
inferior to diagram
exceptions = esophagus adventitia
inferior to diagram
exceptions = esophagus adventitia
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