Table of contents

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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

Antigens

Anatomy & Physiology

21. The Immune System

Antigens

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Multiple Choice

Which of the following is true of antigens?

Antigens are a type of white blood cell.

Antigens are always harmful to the body.

Antigens are produced by the immune system to fight infections.

Antigens are substances that can trigger an immune response.

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Verified step by step guidance

Begin by understanding the definition of antigens. Antigens are substances that can trigger an immune response in the body.

Recognize that antigens are not a type of white blood cell. White blood cells are part of the immune system that respond to antigens.

Understand that antigens are not always harmful. They can be foreign substances like bacteria or viruses, but they can also be harmless substances like pollen.

Clarify that antigens are not produced by the immune system. Instead, they are recognized by the immune system, which then produces antibodies to fight them.

Conclude that the correct statement is: Antigens are substances that can trigger an immune response.