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

Why is 'fingerlike' a good description for the villi in the small intestine?

They help in the mechanical breakdown of food.

They secrete digestive enzymes.

They increase the surface area for absorption.

They transport nutrients directly into the bloodstream.

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Verified step by step guidance

Understand the function of the villi: Villi are small, fingerlike projections that extend into the lumen of the small intestine. Their primary role is to increase the surface area available for nutrient absorption.

Consider the structure-function relationship: The 'fingerlike' shape of the villi is crucial because it maximizes the surface area relative to volume, allowing for more efficient absorption of nutrients.

Compare with other options: While villi do not directly aid in the mechanical breakdown of food or secrete digestive enzymes, their structure is optimized for absorption, which is their main function.

Analyze the absorption process: The increased surface area provided by the villi allows for more contact with digested food, facilitating the transfer of nutrients into the bloodstream through the epithelial cells lining the villi.

Conclude with the correct description: The 'fingerlike' description is apt because it highlights the villi's role in increasing surface area, which is essential for their function in nutrient absorption.