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 best describes how the digestive system works together to process food after it is eaten?

Food is broken down mechanically and chemically as it passes through the mouth, stomach, and intestines, with nutrients absorbed and wastes eliminated.

The stomach alone is responsible for digesting and absorbing all nutrients from food.

Food is immediately absorbed into the bloodstream through the mouth and transported directly to the liver.

The digestive system stores food in the intestines until it is needed for energy.

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Verified step by step guidance

Step 1: Begin by understanding the primary function of the digestive system, which is to break down food into smaller molecules that can be absorbed and utilized by the body. This involves both mechanical and chemical processes.

Step 2: Examine the role of each organ in the digestive system. The mouth initiates digestion through mechanical breakdown (chewing) and chemical breakdown (enzymes in saliva). The stomach continues chemical digestion with gastric juices and mechanical churning.

Step 3: Consider the role of the intestines. The small intestine is responsible for most nutrient absorption, while the large intestine absorbs water and forms waste for elimination.

Step 4: Evaluate the incorrect statements in the problem. For example, the stomach does not absorb all nutrients, and food is not absorbed directly into the bloodstream through the mouth. Additionally, the digestive system does not store food in the intestines for energy; it processes and eliminates waste.

Step 5: Conclude that the correct description of the digestive system's function is the one that includes mechanical and chemical breakdown, nutrient absorption, and waste elimination, as this aligns with the physiological processes of digestion.