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 structural modification of the small intestine slows the movement of chyme through the lumen?

Intestinal crypts

Circular folds (plicae circulares)

Villi

Microvilli

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Verified step by step guidance

Understand the function of the small intestine: The small intestine is responsible for nutrient absorption and digestion. Structural modifications help optimize these processes.

Identify the structural modifications listed in the problem: Circular folds (plicae circulares), villi, microvilli, and intestinal crypts. Each plays a unique role in digestion and absorption.

Focus on the circular folds (plicae circulares): These are large, permanent folds of the mucosa and submucosa that increase the surface area for absorption and slow the movement of chyme through the lumen, allowing more time for nutrient absorption.

Compare the circular folds to other structures: Villi and microvilli increase the surface area for absorption but do not significantly slow chyme movement. Intestinal crypts are involved in secretion and cell renewal, not in slowing chyme movement.

Conclude that circular folds (plicae circulares) are the structural modification responsible for slowing the movement of chyme through the lumen, as they create resistance and turbulence in the flow of chyme.