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

Antigens

Anatomy & Physiology

21. The Immune System

Antigens

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Multiple Choice

Toll-like receptors are found on __________.

mast cells

neutrophils

lymphocytes

macrophages

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Verified step by step guidance

Begin by understanding what Toll-like receptors (TLRs) are. TLRs are a class of proteins that play a key role in the immune system. They are responsible for recognizing pathogens and activating immune cell responses.

Next, identify the types of cells that are involved in the immune response. Mast cells, neutrophils, lymphocytes, and macrophages are all part of the immune system, but they have different roles.

Consider the function of each cell type: Mast cells are involved in allergic responses, neutrophils are a type of white blood cell that helps fight infections, lymphocytes are involved in the adaptive immune response, and macrophages are cells that engulf and digest pathogens and cellular debris.

Focus on macrophages. These cells are known for their role in phagocytosis, where they ingest harmful particles, bacteria, or dead cells. They are also known to express Toll-like receptors on their surface, which helps them recognize and respond to pathogens.

Conclude that Toll-like receptors are found on macrophages, as they are crucial for the macrophage's ability to detect and respond to pathogens effectively.