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

17. The Blood

Leukocytes

Anatomy & Physiology

17. The Blood

Leukocytes

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Multiple Choice

Which of the following immune cells is NOT a professional phagocyte?

NK cells.

Neutrophil.

Macrophage.

Dendritic cell.

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Understand the role of phagocytes in the immune system. Phagocytes are cells that protect the body by ingesting harmful foreign particles, bacteria, and dead or dying cells.

Identify the professional phagocytes among the options. Professional phagocytes are specialized cells that are highly efficient at phagocytosis. These include neutrophils, macrophages, and dendritic cells.

Examine the function of each cell type: Neutrophils are a type of white blood cell that engulfs and digests pathogens. Macrophages are large phagocytic cells that can consume larger particles and pathogens. Dendritic cells are antigen-presenting cells that also perform phagocytosis.

Consider the role of NK cells (Natural Killer cells). NK cells are part of the innate immune system and are primarily involved in the destruction of virus-infected cells and tumor cells, but they do not perform phagocytosis.

Conclude that NK cells are not professional phagocytes, as their primary function is cytotoxicity rather than phagocytosis.