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

What is the primary function of the villi in the small intestine?

To transport bile from the liver

To secrete digestive enzymes

To increase the surface area for absorption of nutrients

To produce hydrochloric acid

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Verified step by step guidance

Understand the structure of the small intestine: The small intestine is a long, coiled tube where most digestion and absorption of nutrients occur. It is divided into three parts: the duodenum, jejunum, and ileum.

Identify the role of villi: Villi are small, finger-like projections that line the walls of the small intestine. They are covered with epithelial cells and contain blood vessels and lymphatic vessels.

Recognize the importance of surface area: The primary function of villi is to increase the surface area of the intestinal lining. This is crucial because a larger surface area allows for more efficient absorption of nutrients.

Explain nutrient absorption: Nutrients from digested food pass through the epithelial cells of the villi and enter the bloodstream or lymphatic system. This process is facilitated by the increased surface area provided by the villi.

Clarify misconceptions: While the small intestine does play a role in digestion, the villi themselves do not transport bile, secrete digestive enzymes, or produce hydrochloric acid. Their main function is to enhance nutrient absorption.