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 part of the digestive system releases the enzyme pepsin?

Mouth

Stomach

Small intestine

Pancreas

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Verified step by step guidance

Step 1: Understand the role of pepsin in digestion. Pepsin is an enzyme responsible for breaking down proteins into smaller peptides. It is active in acidic environments.

Step 2: Recall the anatomy of the digestive system and identify the organ that provides an acidic environment. The stomach is known for its acidic gastric juices, which are essential for pepsin activation.

Step 3: Learn how pepsin is released. Pepsin is secreted in an inactive form called pepsinogen by the chief cells in the stomach lining. It is activated into pepsin when exposed to hydrochloric acid (HCl) in the stomach.

Step 4: Eliminate other options based on their functions. The mouth primarily handles mechanical digestion and releases enzymes like amylase for carbohydrate digestion. The small intestine is involved in nutrient absorption and releases enzymes for further digestion, but not pepsin. The pancreas secretes digestive enzymes like lipase and amylase, but not pepsin.

Step 5: Conclude that the stomach is the correct answer, as it is the organ responsible for releasing pepsin in its inactive form (pepsinogen), which is then activated in the acidic gastric environment.