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 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

Which of the following is NOT a property of interferons (IFNs)?

IFNs have antiviral activity.

IFNs stimulate B cells to produce antibodies.

IFNs activate macrophages.

IFNs have an anticancer role.

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Verified step by step guidance

Understand the role of interferons (IFNs) in the immune system. Interferons are proteins that are part of the body's defense mechanism against viruses and other pathogens.

Recognize that interferons have antiviral activity. They help inhibit viral replication within host cells, which is a key property of IFNs.

Identify that interferons activate macrophages. Macrophages are immune cells that engulf and digest pathogens, and IFNs enhance their activity.

Note that interferons have an anticancer role. They can inhibit the growth of cancer cells and modulate the immune response against tumors.

Evaluate the statement about IFNs stimulating B cells to produce antibodies. This is not a typical property of interferons, as their primary role is not directly related to antibody production by B cells.