Multiple Choice
Which type of agranulocyte is primarily responsible for antibody-mediated (humoral) immunity?
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21. The Immune System
Cells of the Immune System: Agranulocytes
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Which of the following immune cells is NOT a professional phagocyte?
A
NK cell.
B
Neutrophil.
C
Macrophage.
D
Dendritic cell.
Verified step by step guidance1
Understand the role of phagocytes in the immune system. Phagocytes are cells that engulf and digest pathogens and debris. They are crucial for the innate immune response.
Identify the professional phagocytes among the options. Professional phagocytes are cells specialized in phagocytosis, including neutrophils, macrophages, and dendritic cells.
Recognize the function of each cell type: Neutrophils are the most abundant type of white blood cells and are first responders to infection. Macrophages are versatile cells that reside in tissues and can engulf pathogens and dead cells. 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 but are not professional phagocytes. They are involved in the destruction of infected or cancerous cells through cytotoxic activity, not phagocytosis.
Conclude that NK cells do not perform phagocytosis and are therefore not considered professional phagocytes, unlike the other options provided.
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