Download Class Topics

5/22/2017
Title:
Anat & Phys
3/2/07
Objectives:
.
Class Topics
• Stomach
• Video “Fat and Happy”
"The pessimist sees difficulty in every
opportunity. The optimist sees opportunity
in every difficulty."
Winston Churchill
Monday, May 22, 2017 2:53 PM
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Class Assignments
What
By When
• Due this class period
• Due next class period
• Due in the future
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Stomach
3 major functions
• 1. Storage of ingested food
• 2. Disruption of chemical bonds found
in ingested food
• 3. Mechanical processing of ingested
food
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Stomach
• Produces soupy mixture of partially
digested material, acids, enzymes
– chyme
• Rugae: many folds
– allows for expansion
– 1.0-1.5 liters in a full stomach
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Stomach regions
• Cardia
– secretes mucus
• Fundus
– used in cases of a
very full stomach
– can contain air
• Pylorus
– region in which
chyme is
transported to
small intestine
• burp
• Body
– region of mechanical
processing
• Most gastric pits
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Stomach
Drawing
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Gastric Pits
• Found in mucosa and submucosa
• Secrete gastric juices
• Parietal cells
– secrete HCl
• transported as two separate ions
– pH - 1.5-2.0
• breaks down cell walls and connective tissue
• kills most microorganisms
• activates pepsin (digestive enzyme)
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Gastric Pits
• Chief cells
– secrete pepsinogen
• inactive enzyme
• cleaves into pepsin (HCl)
• Endocrine cells
– secrete hormones
• gastrin - stimulates secretions from parietal
and chief cells and muscle contractions
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Video
• Fat and Happy
– Complete the worksheet
• Eating to Live
– Make a note of the different areas of
the digestive tract throughout the video
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Ruminant Digestion
• 4 chambered stomach
–
–
–
–
Reticulum
Rumen
Omasum
abomasum
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Gastric Bypass Surgery
• NIDDK web site
Image taken from http://www.georgetownsurgical.com/procedure.html
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Other examples
• Rabbits
• Horses
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