Ch. 23 - The Digestive SystemSee all chapters
All Chapters
Ch. 1 - Introduction to Physiology
Ch. 2 - Molecules and Molecular Interactions
Ch. 3 - Cells and Tissues
Ch. 4 - Cell Metabolism: Bioenergetics, Enzymes, and Respiration
Ch. 5 - Membrane Dynamics
Ch. 6 - Cell Communication
Ch. 7 - Integumentary System
Ch. 8 - Bone and Cartilage
Ch. 9 - Skeletal System
Ch. 10 - Joints
Ch. 11 - Muscles
Ch. 12 - The Nervous System I: Neurons and Neuronal Networks
Ch. 13 - The Nervous System II: The Central Nervous System
Ch. 14 - The Autonomic Nervous System
Ch. 15 - Sensory Physiology
Ch. 16 - The Endocrine System
Ch. 17 - Cardiovascular Physiology I: The Heart
Ch. 18 - Cardiovascular Physiology II: Blood, Blood Vessels, Circulation, and Exchange
Ch. 19 - The Urinary System
Ch. 20 - Respiratory Physiology
Ch. 21 - Acid-Base Balance-- Controlling Blood pH
Ch. 22 - Introduction to the Immune System
Ch. 23 The Lymphatic System
Ch. 23 - The Digestive System
Ch. 24 - Regulation of Metabolism and Energy Balance
Ch. 25 - Human Sexual Reproduction and Development

Concept #1: Enteric Nervous System and Short vs. Long Reflexes

Concept #2: The Gastrointestinal Reflexes

Concept #3: The GI Peptides-- GIP, GLP-1, CCK, Leptin, Ghrelin

Practice: A 20-year-old undergraduate brings a pepperoni pizza to share with her study group. One study group member’s mouth starts watering and stomach starts rumbling at the mere sight and smell of the pizza (i.e. before he even takes a bite). Which of the following explains his salivation and increased GI motility before eating anything?

Practice: A 20-year-old man presents to his primary-care physician complaining of frequent defecation. He reports that he always has to leave the dinner table immediately after meals to use the bathroom, which is starting to get inconvenient and embarrassing (he’s been dating a lot recently). Which of the following reflexes is causing this sudden urge to defecate after meals?

Practice: A 25-year-old medical student has a date scheduled for 7pm. It is currently 5pm and he is ravenously hungry, but doesn’t want to ruin his appetite for the date (they’re going to a delicious, romantic Italian restaurant). He decides to eat a small snack. Which of the following foods should he avoid if he wants to eat something but still wants to feel hungry for his date in two hours? (Hint: Think about the stimuli that cause the release of the various GI peptides.)