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 layer of the alimentary canal wall secretes mucus and enzymes?

Submucosa

Muscularis externa

Serosa

Mucosa

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Verified step by step guidance

Begin by understanding the structure of the alimentary canal wall, which consists of four main layers: mucosa, submucosa, muscularis externa, and serosa.

The mucosa is the innermost layer of the alimentary canal wall and is responsible for secretion and absorption. It consists of three sub-layers: the epithelium, lamina propria, and muscularis mucosae.

The epithelium of the mucosa is primarily responsible for secreting mucus and digestive enzymes. Mucus serves to protect the lining of the digestive tract and facilitate the movement of food, while enzymes aid in the breakdown of food substances.

The submucosa is the layer beneath the mucosa, containing blood vessels, nerves, and glands, but it is not primarily responsible for secretion of mucus and enzymes.

The muscularis externa is responsible for peristalsis and movement of food through the digestive tract, while the serosa is the outermost layer providing protection and structural support. Neither of these layers is involved in the secretion of mucus and enzymes.