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

21. The Immune System

Introduction to the Immune System

Anatomy & Physiology

21. The Immune System

Introduction to the Immune System

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Multiple Choice

Which of the following is considered the body's primary defense mechanism in the immune system?

Lymph nodes

Skin

Spleen

Bone marrow

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Verified step by step guidance

Understand the role of the skin in the immune system: The skin acts as a physical barrier, preventing pathogens from entering the body. It is the first line of defense in the immune system.

Consider the structure and function of the skin: The skin is composed of multiple layers, including the epidermis and dermis, which provide protection against mechanical damage and pathogens.

Recognize the importance of the skin's chemical defenses: The skin secretes antimicrobial substances, such as sweat and sebum, which help to inhibit the growth of bacteria and fungi.

Compare the skin's role to other components of the immune system: While lymph nodes, spleen, and bone marrow are crucial for immune responses, they act after pathogens have entered the body, whereas the skin prevents entry.

Conclude that the skin is the body's primary defense mechanism: Given its role as a physical and chemical barrier, the skin is considered the body's primary defense mechanism in the immune system.