Textbook Question
Describe the regulation of the cephalic, gastric, and intestinal phases of gastric secretion.
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Ch. 23 The Digestive System
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091
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Table of contents
- Ch. 1 The Human Body: An Orientation24
- Ch. 2 Chemistry Comes Alive25
- Ch. 3 Cells: The Living Units24
- Ch. 4 Tissue: The Living Fabric19
- Ch. 5 The Integumentary System10
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton11
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System26
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue23
- Ch. 12 The Central Nervous System26
- Ch. 13 The Peripheral Nervous System and Reflex Activity28
- Ch. 14 The Autonomic Nervous System18
- Ch. 16 The Endocrine System26
- Ch. 17 Blood27
- Ch. 18 The Cardiovascular System: The Heart22
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues16
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses29
- Ch. 22 The Respiratory System20
- Ch. 23 The Digestive System30
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System25
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System23
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091Not the one you use?Change textbook
Chapter 22, Problem 22
Describe the role of these cells found in gastric glands: parietal, chief, mucous neck, and enteroendocrine.
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Identify the location of the gastric glands in the stomach lining, which contain different specialized cells responsible for digestion and protection.
Explain that parietal cells secrete hydrochloric acid (HCl), which helps create an acidic environment for digestion and activates enzymes, and intrinsic factor, which is essential for vitamin B12 absorption.
Describe chief cells as the producers of pepsinogen, an inactive enzyme that is converted into pepsin in the acidic stomach environment to break down proteins.
Clarify that mucous neck cells secrete mucus that protects the stomach lining from the corrosive effects of acid and digestive enzymes, maintaining the integrity of the stomach wall.
Discuss enteroendocrine cells, which release hormones such as gastrin into the bloodstream to regulate digestive processes, including stimulating acid secretion and gastric motility.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Parietal Cells
Parietal cells are specialized cells in the gastric glands responsible for secreting hydrochloric acid (HCl), which helps maintain the stomach's acidic environment necessary for digestion. They also produce intrinsic factor, essential for vitamin B12 absorption in the small intestine.
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Cell Junctions
Chief Cells
Chief cells are gastric gland cells that secrete pepsinogen, an inactive enzyme precursor. Once exposed to the acidic stomach environment, pepsinogen converts into pepsin, an enzyme that breaks down proteins into smaller peptides during digestion.
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Mucous Neck and Enteroendocrine Cells
Mucous neck cells produce mucus that protects the stomach lining from acid damage and mechanical injury. Enteroendocrine cells secrete hormones like gastrin, which regulate gastric secretions and motility, coordinating digestive processes.
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04:19The Head and Neck
Related Practice
Textbook Question
Lara was on a diet but she could not eat less and kept claiming her stomach had a mind of its own. She was joking, but indeed, there is a 'gut brain' called the enteric nervous system. Is it part of the parasympathetic and sympathetic nervous system? Explain.
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Textbook Question
a. What is the relationship between the cystic, common hepatic, bile, and pancreatic ducts?
b. What is the point of fusion of the bile and pancreatic ducts called?
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Textbook Question
Describe the two phases of swallowing, noting the organs involved and the activities that occur.
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Textbook Question
a. Describe the boundaries of the oral cavity.
b. Why do you suppose its mucosa is stratified squamous epithelium rather than the more typical simple columnar epithelium?
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Textbook Question
Explain why fatty stools result from the absence of bile or pancreatic juice.
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