Physiology 3120 Lecture Notes - Lecture 1: Bicarbonate, Autoimmune Disease, Blood Plasma

55 views7 pages
GI Tract
Lecture 1
Four Processes of the GI Tract
Organs of the GI Tract
1. Digestion Chemical & Mechanical
2. Absorption
3. Motility also helps with digestion
o Slows food down to give enzymes
enough time to digest
o Muscular contractions helps
pulverise food
4. Secretion helps with digestion
o Into tract (water, mucus,
enzymes)
o Into blood (hormones, factors,
etc)
Stomach reservoir
Small intestine Place where accessory
organs converge (most essential part of
GI tract)
find more resources at oneclass.com
find more resources at oneclass.com
Unlock document

This preview shows pages 1-2 of the document.
Unlock all 7 pages and 3 million more documents.

Already have an account? Log in
Accessory Glands: mostly exocrine secretion
Upper Esophageal Sphincter: closes off mouth to esophagus
Lower Esophageal Sphincter: closes of esophagus to stomach
Pyloric Sphincter: only opens when we want bolus down small intestine
Ileocecal Valve: maintain different compartments of small & large intestine (large
intestine is a bacterial house so very important to keep them separate)
Anal Sphincter: voluntary by age 3
General Layers of the GI Tract
Stomach, small intestine, large intestine
Mucous membrane:
1. Enterocytes simple epithelial cells
Variable: absorptive & exocrine function & endocrine function
2. Lamina propria
Lymphatic vessels and BVs
3. Muscularis mucosae
Smooth muscle
Folds to increase SA
Submucosa:
o Small lymphatic vessels and BVs
o Lymph nodes have the most compared to rest of body
o Stretchy & helps adheres the mucosa to muscularis externa
o Submucosal plexus
Muscularis externa:
o Circular & longitudinal SM & BVs
o Changes diameter & shape of digestive tract
o Motility & digestion
o Myenteric plexus have as many here as we do in spinal cord
find more resources at oneclass.com
find more resources at oneclass.com
Unlock document

This preview shows pages 1-2 of the document.
Unlock all 7 pages and 3 million more documents.

Already have an account? Log in

Get OneClass Notes+

Unlimited access to class notes and textbook notes.

YearlyBest Value
75% OFF
$8 USD/m
Monthly
$30 USD/m
You will be charged $96 USD upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.