Multiple Choice
Which granulocyte is capable of phagocytizing an antigen and displaying fragments of it on its surface (antigen presentation)?
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19. Innate Immunity
Cells of the Immune System: Granulocytes
Multiple Choice
Which of the following granulocytes is primarily responsible for phagocytizing and digesting invading microorganisms?
A
Basophils
B
Eosinophils
C
Neutrophils
D
Lymphocytes
Verified step by step guidance1
Step 1: Understand the types of granulocytes listed: Basophils, Eosinophils, and Neutrophils. Granulocytes are a category of white blood cells characterized by the presence of granules in their cytoplasm.
Step 2: Recall the primary functions of each granulocyte: Basophils are mainly involved in allergic responses and release histamine; Eosinophils primarily combat parasitic infections and modulate allergic reactions; Neutrophils are the first responders to bacterial infection and are highly effective at phagocytosis.
Step 3: Define phagocytosis: it is the process by which certain cells engulf and digest microorganisms and cellular debris, an essential mechanism in innate immunity.
Step 4: Identify which granulocyte is specialized for phagocytosis and digestion of invading microorganisms. Neutrophils have a high capacity for phagocytosis and contain enzymes in their granules that help digest pathogens.
Step 5: Conclude that among the options, neutrophils are primarily responsible for phagocytizing and digesting invading microorganisms, making them key players in the body's defense against bacterial infections.
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