Table of contents

1. Introduction to Anatomy & Physiology5h 42m
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 Heart2h 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

First-Line Defenses: Chemical Barriers

Anatomy & Physiology

21. The Immune System

First-Line Defenses: Chemical Barriers

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Multiple Choice

Complement proteins work by __________.

producing antibodies

forming pores in the membranes of target cells

phagocytosis of target cells

creating an impermeable barrier

neutralization of antigens

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Verified step by step guidance

Understand the role of complement proteins in the immune system. Complement proteins are part of the innate immune system and help to enhance the ability of antibodies and phagocytic cells to clear pathogens from an organism.

Recognize that complement proteins do not produce antibodies. Antibodies are produced by B cells, which are part of the adaptive immune system.

Identify the mechanism by which complement proteins form pores in the membranes of target cells. This process is known as the Membrane Attack Complex (MAC), which leads to cell lysis.

Clarify that complement proteins do not directly perform phagocytosis. Instead, they opsonize pathogens, marking them for phagocytosis by other immune cells.

Understand that complement proteins do not create an impermeable barrier or neutralize antigens directly. Their primary function is to disrupt the membrane integrity of pathogens, leading to their destruction.