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

Small intestine

Stomach

Large intestine

Esophagus

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Verified step by step guidance

Understand the function of each organ listed in the options: The stomach is primarily responsible for breaking down food using acids and enzymes, the large intestine absorbs water and electrolytes, the esophagus is a muscular tube that transports food to the stomach, and the small intestine is the primary site for nutrient absorption.

Recall the anatomy of the small intestine: It consists of three sections—duodenum, jejunum, and ileum. The majority of nutrient absorption occurs in the jejunum and ileum, with the duodenum playing a role in digestion.

Consider the structural adaptations of the small intestine: The presence of villi and microvilli increases the surface area for absorption, making it highly efficient at absorbing nutrients like carbohydrates, proteins, fats, vitamins, and minerals.

Eliminate incorrect options: The stomach does not absorb nutrients significantly, the large intestine focuses on water absorption, and the esophagus is not involved in absorption at all.

Conclude that the small intestine is the correct answer because it is specifically designed for nutrient absorption, supported by its structure and function in the digestive system.