Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

23. The Digestive System

Introduction to the Digestive System

Anatomy & Physiology

23. The Digestive System

Introduction to the Digestive System

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Multiple Choice

Which type of stomach cells is responsible for releasing hydrochloric acid (HCl)?

Chief cells

Mucous cells

Parietal cells

G cells

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Verified step by step guidance

Step 1: Understand the function of hydrochloric acid (HCl) in the stomach. HCl is crucial for digestion as it helps break down food, activates pepsinogen into pepsin, and provides an acidic environment to kill pathogens.

Step 2: Review the types of stomach cells and their functions: Chief cells secrete pepsinogen, mucous cells produce mucus to protect the stomach lining, G cells secrete gastrin (a hormone that stimulates HCl production), and parietal cells are responsible for secreting hydrochloric acid (HCl).

Step 3: Focus on parietal cells. These cells are located in the gastric glands of the stomach lining and contain proton pumps that actively transport hydrogen ions (H⁺) into the stomach lumen, combining with chloride ions (Cl⁻) to form HCl.

Step 4: Understand the regulation of parietal cells. Gastrin (from G cells), histamine, and acetylcholine stimulate parietal cells to release HCl, while somatostatin inhibits their activity.

Step 5: Confirm the correct answer based on the function of parietal cells. Parietal cells are the stomach cells responsible for releasing hydrochloric acid (HCl).