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

5. Integumentary System

Introduction to the Integumentary System

Anatomy & Physiology

5. Integumentary System

Introduction to the Integumentary System

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Multiple Choice

Sebum protects the skin from which of the following?

Mechanical injury

Ultraviolet radiation

Cold temperatures

Dehydration

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Verified step by step guidance

Step 1: Understand the role of sebum in the skin. Sebum is an oily substance secreted by sebaceous glands in the skin. Its primary function is to lubricate and waterproof the skin and hair, preventing dryness and dehydration.

Step 2: Analyze the options provided in the question. Mechanical injury, ultraviolet radiation, and cold temperatures are external factors that sebum does not directly protect against. Instead, sebum forms a barrier to reduce water loss from the skin.

Step 3: Relate the function of sebum to dehydration. Sebum helps maintain the skin's moisture by preventing excessive evaporation of water from the skin's surface, which is crucial for hydration.

Step 4: Eliminate incorrect options. Mechanical injury, ultraviolet radiation, and cold temperatures are not directly mitigated by sebum. These factors require other protective mechanisms, such as the skin's structure or melanin production.

Step 5: Conclude that the correct answer is dehydration, as sebum's primary role is to prevent water loss and maintain skin hydration.