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

Where does most digestion take place in the human digestive system?

Small intestine

Stomach

Large intestine

Esophagus

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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 stomach is responsible for mechanical digestion and the initial breakdown of proteins using gastric juices. The esophagus is a muscular tube that transports food from the mouth to the stomach but does not perform digestion. The large intestine primarily absorbs water and electrolytes, with minimal digestion occurring.

Step 2: Focus on the small intestine. It is the longest part of the digestive system and is specialized for most digestion and nutrient absorption. Enzymes from the pancreas and bile from the liver are secreted into the small intestine to aid in breaking down carbohydrates, proteins, and fats.

Step 3: Recall that the small intestine has three sections: the duodenum, jejunum, and ileum. The duodenum is where most chemical digestion occurs, while the jejunum and ileum are primarily involved in nutrient absorption.

Step 4: Compare the functions of the small intestine with the other organs listed. The small intestine is the only organ where most digestion and absorption of nutrients occur, making it the correct answer.

Step 5: Conclude that the correct answer is 'Small intestine' based on its role in digestion and nutrient absorption, supported by the anatomical and physiological functions of the digestive system.