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

Classes of Antibodies

Anatomy & Physiology

21. The Immune System

Classes of Antibodies

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Multiple Choice

Which part of an antibody attaches to an antigen?

Variable region

Hinge region

Fc region

Constant region

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Verified step by step guidance

Understand the structure of an antibody: Antibodies, also known as immunoglobulins, are Y-shaped proteins that play a crucial role in the immune response. They consist of two main regions: the variable region and the constant region.

Identify the variable region: The variable region is located at the tips of the 'Y' shape of the antibody. This region is unique to each antibody and is responsible for binding to specific antigens.

Recognize the role of the variable region: The variable region contains the antigen-binding sites. These sites are highly specific and allow the antibody to attach to a particular antigen, much like a lock and key mechanism.

Differentiate from other regions: The constant region, Fc region, and hinge region have different roles. The constant region determines the class of the antibody and mediates effector functions. The Fc region is involved in interactions with cell receptors and complement proteins. The hinge region provides flexibility to the antibody structure.

Conclude that the variable region is responsible for antigen attachment: Given the specific role of the variable region in binding to antigens, it is the part of the antibody that attaches to an antigen.