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 portion of an antibody binds to an antigen?

Fc region

Variable region

Hinge 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 by identifying and neutralizing foreign objects like bacteria and viruses.

Identify the regions of an antibody: An antibody consists of two main regions - the constant region (Fc region) and the variable region. The constant region is responsible for effector functions, while the variable region is involved in antigen binding.

Focus on the variable region: The variable region is located at the tips of the 'Y' shape of the antibody. It is called 'variable' because it varies greatly between different antibodies, allowing them to bind specifically to a wide variety of antigens.

Understand antigen binding: The variable region contains the antigen-binding sites, which are specific to particular antigens. This specificity is due to the unique amino acid sequences in the variable region that form a specific three-dimensional structure complementary to the antigen.

Conclude that the variable region is responsible for binding to the antigen: The antigen-binding sites within the variable region interact with the antigen's epitopes, allowing the antibody to attach to the antigen and mark it for destruction or neutralization by the immune system.