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 Inflammation

Anatomy & Physiology

21. The Immune System

Introduction to Inflammation

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Multiple Choice

Which of the following answers is an inflammatory mediator that stimulates vasodilation allowing immune cells to enter the site of infection?

Collagen.

Serotonin.

C3b protein.

Histamine.

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Verified step by step guidance

Understand the role of inflammatory mediators in the immune response. These are substances released by immune cells that help coordinate the body's response to infection or injury.

Recognize that vasodilation is the widening of blood vessels, which increases blood flow to the affected area, allowing immune cells to reach the site of infection more effectively.

Identify histamine as a key inflammatory mediator. Histamine is released by mast cells and basophils during an immune response and is known for its role in causing vasodilation.

Differentiate histamine from other substances listed in the options. Collagen is a structural protein, serotonin is a neurotransmitter, and C3b protein is part of the complement system involved in opsonization, not vasodilation.

Conclude that histamine is the correct answer because it directly stimulates vasodilation, facilitating the movement of immune cells to the site of infection.