Unit 5 Notes:
The Stomach
(1) About The Stomach
• Stomach can contain up to 1.5L of food without
pressure changes.
– Feelings of discomfort come fro...
(2) Dig. In The Stomach
• Mechanical Digestion:
–Peristaltic churning of stomach
muscle breaks apart bolus.
–Triggered by ...
(3) Release of Gastric Juice
• Gastrin (hormone) released from GCells within Rugae:
– Triggered by smell + taste of food
–...
(4) Gastric Juice
Contains…
• HCl = Hydrochloric Acid
• Pepsin = Enzyme = Breaks down
protein
• Rennin = Enzyme = Breaks d...
(5) Protein Metabolism
• Proteins take a lot of Gastric
Juice to Metabolize.
• Breaking Down Proteins
releases H+ ions.
• ...
(6) Leaving The Stomach
• The mass leaving the stomach is called
“Chyme”:
– Mostly liquid  Liquids leave first!
– Solids ...
Anatomy unit 4 digestive and excretory systems stomach notes
Anatomy unit 4 digestive and excretory systems stomach notes
Anatomy unit 4 digestive and excretory systems stomach notes
Anatomy unit 4 digestive and excretory systems stomach notes
Anatomy unit 4 digestive and excretory systems stomach notes
Anatomy unit 4 digestive and excretory systems stomach notes
Anatomy unit 4 digestive and excretory systems stomach notes
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Anatomy unit 4 digestive and excretory systems stomach notes

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Anatomy unit 4 digestive and excretory systems stomach notes

  1. 1. Unit 5 Notes: The Stomach
  2. 2. (1) About The Stomach • Stomach can contain up to 1.5L of food without pressure changes. – Feelings of discomfort come from irritants + too much food • Stomach composed of excess tissue  Folds of Tissue = Rugae – Folds allow the stomach to expand – Folds also contain secretion glands • Food sits in the stomach for 3-4 hours – Depends on Amount & Type of food
  3. 3. (2) Dig. In The Stomach • Mechanical Digestion: –Peristaltic churning of stomach muscle breaks apart bolus. –Triggered by release of serotonin from rugae • Chemical Digestion: –Gastric Juice contains enzymes and acid that breaks down
  4. 4. (3) Release of Gastric Juice • Gastrin (hormone) released from GCells within Rugae: – Triggered by smell + taste of food – Triggered by increase in pH • Gastrin stimulates release of HCl = Decreasing pH: – Proteins & Carbohydrates Metabolized – Small & Large Intestine stimulated
  5. 5. (4) Gastric Juice Contains… • HCl = Hydrochloric Acid • Pepsin = Enzyme = Breaks down protein • Rennin = Enzyme = Breaks down protein • Muccin = Mucus = Lubricate Food Mass
  6. 6. (5) Protein Metabolism • Proteins take a lot of Gastric Juice to Metabolize. • Breaking Down Proteins releases H+ ions. • Decreases pH of stomach. • G-Cells stop releasing gastrin  HCl stopped.
  7. 7. (6) Leaving The Stomach • The mass leaving the stomach is called “Chyme”: – Mostly liquid  Liquids leave first! – Solids are left behind until broken down • Approximately 3mL of food leaves at one time…. – Food Exits the Pyloric Sphincter – Chyme dumped into Small Intestine

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