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 of the following structures is the primary site of nutrient absorption in the digestive system?

Esophagus

Small intestine

Stomach

Large intestine

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Verified step by step guidance

Step 1: Begin by understanding the primary function of each structure listed in the options. The esophagus is responsible for transporting food from the mouth to the stomach, not for nutrient absorption.

Step 2: Examine the stomach's role in digestion. The stomach primarily breaks down food mechanically and chemically using enzymes and acids, but it is not the main site for nutrient absorption.

Step 3: Consider the large intestine's function. The large intestine absorbs water and electrolytes, but it is not the primary site for nutrient absorption.

Step 4: Focus on the small intestine. The small intestine is the primary site of nutrient absorption due to its specialized structures, such as villi and microvilli, which increase surface area for absorption.

Step 5: Conclude that the small intestine is the correct answer based on its role in absorbing nutrients like carbohydrates, proteins, fats, vitamins, and minerals into the bloodstream.