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 cellular mediator is primarily involved in the development of Type I hypersensitivity reactions?

Macrophages

Mast cells

B cells

Neutrophils

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Verified step by step guidance

Understand the context of Type I hypersensitivity reactions, which are also known as immediate allergic reactions. These reactions occur when the immune system responds excessively to a harmless substance, such as pollen or pet dander.

Recognize that Type I hypersensitivity is mediated by IgE antibodies. These antibodies bind to specific receptors on certain immune cells, leading to the release of inflammatory mediators.

Identify the key immune cells involved in Type I hypersensitivity. Mast cells are the primary cells that play a crucial role in these reactions. They are found in tissues throughout the body and contain granules rich in histamine and other chemicals.

Learn how mast cells contribute to the hypersensitivity reaction. When IgE antibodies on the surface of mast cells bind to an allergen, it triggers the mast cells to degranulate, releasing histamine and other substances that cause symptoms like swelling, redness, and itching.

Differentiate mast cells from other immune cells listed in the options, such as macrophages, B cells, and neutrophils. While these cells have important roles in the immune system, they are not primarily involved in Type I hypersensitivity reactions.