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 Complement System

Anatomy & Physiology

21. The Immune System

Introduction to the Complement System

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Multiple Choice

Which complement protein acts as an opsonin in the immune response?

C5a

C1q

C3b

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Verified step by step guidance

Understand the role of opsonins: Opsonins are molecules that enhance phagocytosis by marking antigens for an immune response. They bind to the surface of pathogens and make them more recognizable to phagocytes.

Identify the complement system: The complement system is a part of the immune system that enhances the ability of antibodies and phagocytic cells to clear microbes and damaged cells, promote inflammation, and attack the pathogen's cell membrane.

Learn about complement proteins: Complement proteins are a group of proteins that play a crucial role in the immune response. They are activated in a cascade manner and have various functions, including opsonization, chemotaxis, and cell lysis.

Focus on C3b: C3b is a fragment of the complement protein C3. It acts as an opsonin by binding to the surface of pathogens, thereby facilitating their recognition and ingestion by phagocytes.

Differentiate between complement proteins: While C5a is involved in chemotaxis and inflammation, and C1q is part of the classical pathway activation, C3b specifically functions as an opsonin, marking pathogens for phagocytosis.