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

Preventing the entry of disease-causing microorganisms is primarily the function of which layer of the skin?

Epidermis

Hypodermis

Subcutaneous tissue

Dermis

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Verified step by step guidance

Understand the structure of the skin: The skin is composed of three main layers—epidermis, dermis, and hypodermis (also referred to as subcutaneous tissue). Each layer has distinct functions and characteristics.

Focus on the epidermis: The epidermis is the outermost layer of the skin and serves as the primary barrier against environmental factors, including disease-causing microorganisms. It contains specialized cells such as keratinocytes that produce keratin, a protein that strengthens the skin's protective barrier.

Consider the dermis: The dermis lies beneath the epidermis and is responsible for providing structural support, elasticity, and housing blood vessels, nerves, and glands. While it plays a role in overall skin health, it is not the primary barrier against microorganisms.

Examine the hypodermis: The hypodermis, or subcutaneous tissue, is the innermost layer of the skin. It primarily functions as insulation, cushioning, and energy storage through fat deposits. It does not directly prevent the entry of microorganisms.

Conclude that the epidermis is the correct answer: Based on its role as the outermost layer and its specialized function in preventing the entry of pathogens, the epidermis is the layer of the skin responsible for this task.