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

Small intestine

Large intestine

Esophagus

Stomach

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Verified step by step guidance

Step 1: Begin by understanding the primary function of each organ listed in the options. The digestive system is responsible for breaking down food, absorbing nutrients, and eliminating waste.

Step 2: Recall that the esophagus is primarily involved in transporting food from the mouth to the stomach. It does not play a significant role in nutrient absorption.

Step 3: Consider the stomach's role. The stomach is responsible for mechanical and chemical digestion, breaking down food into chyme. However, nutrient absorption is minimal here, with the exception of some substances like alcohol and certain medications.

Step 4: Evaluate the large intestine. Its primary function is to absorb water and electrolytes, compact waste, and house gut bacteria. Nutrient absorption is not its main role.

Step 5: Focus on the small intestine. The small intestine is the primary site of nutrient absorption in the digestive system. It has specialized structures like villi and microvilli that increase surface area for efficient absorption of nutrients such as carbohydrates, proteins, fats, vitamins, and minerals.