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

In the context of the immune system, what is a naive lymphocyte?

A lymphocyte that has undergone clonal expansion

A lymphocyte that has been activated and is producing antibodies

A lymphocyte that has not yet encountered an antigen

A lymphocyte that is part of the innate immune response

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Verified step by step guidance

Understand the role of lymphocytes in the immune system: Lymphocytes are a type of white blood cell that play a crucial role in the adaptive immune response. They include B cells and T cells, which are responsible for recognizing specific antigens and mounting an immune response.

Define 'naive lymphocyte': A naive lymphocyte is a lymphocyte that has not yet encountered its specific antigen. It is in a resting state, waiting to be activated by the presence of an antigen.

Differentiate between naive and activated lymphocytes: Once a naive lymphocyte encounters its specific antigen, it becomes activated. This activation leads to clonal expansion, where the lymphocyte proliferates and differentiates into effector cells that can combat the antigen.

Clarify the term 'clonal expansion': Clonal expansion is the process by which an activated lymphocyte divides and produces many copies of itself. This is crucial for mounting an effective immune response, as it increases the number of cells that can recognize and respond to the antigen.

Explain why a naive lymphocyte is not part of the innate immune response: The innate immune response is the body's first line of defense and is non-specific. Naive lymphocytes are part of the adaptive immune response, which is specific and involves the recognition of specific antigens.