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 Innate Immunity

Anatomy & Physiology

21. The Immune System

Introduction to Innate Immunity

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Multiple Choice

In what way are the three lines of defense in the immune system similar?

They all involve the production of antibodies.

They all serve to protect the body against pathogens.

They all involve the activation of T-cells.

They all require prior exposure to a pathogen to be effective.

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Verified step by step guidance

Understand the concept of the immune system's lines of defense: The immune system is divided into three lines of defense. The first line includes physical and chemical barriers like skin and mucous membranes. The second line involves non-specific immune responses such as inflammation and phagocytosis. The third line is the adaptive immune response, which includes the production of antibodies and activation of T-cells.

Identify the common goal of all three lines of defense: Despite their differences, all three lines of defense share the primary goal of protecting the body against pathogens, which are harmful organisms like bacteria, viruses, and fungi.

Analyze the role of antibodies and T-cells: Antibodies are part of the adaptive immune response (third line), while T-cells are also involved in the adaptive immune response. The first and second lines do not involve these specific components.

Consider the requirement of prior exposure: The adaptive immune response (third line) often requires prior exposure to a pathogen to be effective, as it relies on memory cells. The first and second lines do not require prior exposure.

Conclude the similarity: The similarity among the three lines of defense is that they all serve to protect the body against pathogens, regardless of the specific mechanisms or components involved.