Stomach

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Class Topics
Title Anat Phys 3/2/07
Objectives

• .

• Stomach
• Video Fat and Happy
• "The pessimist sees difficulty in every
  opportunity. The optimist sees opportunity in
  every difficulty."
• Winston Churchill

Sunday, February 21, 2016 236 PM
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Class Assignments
By When
What

• Due this class period
• Due next class period
• Due in the future

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Stomach3 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
• burp
• Body
• region of mechanical processing
• Most gastric pits

• Pylorus
• region in which chyme is transported to small
  intestine

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StomachDrawing

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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