Multiple Choice
The adaptive immune response is the first immune response a host initiates against a pathogen.
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21. The Immune System
Overview of Host Defenses
Multiple Choice
In an overview of host defenses, which type of leukocyte is best described as a small white blood cell with a large, round nucleus and scant cytoplasm?
A
Neutrophil
B
Lymphocyte
C
Monocyte
D
Eosinophil
Verified step by step guidance1
Step 1: Understand the characteristics of different leukocytes (white blood cells) involved in host defenses, focusing on their size, nucleus shape, and cytoplasm amount.
Step 2: Recall that neutrophils are typically larger cells with a multi-lobed nucleus and more abundant cytoplasm, often involved in acute inflammation.
Step 3: Recognize that monocytes are large white blood cells with a kidney-shaped nucleus and more cytoplasm compared to lymphocytes.
Step 4: Know that eosinophils have a bilobed nucleus and contain granules in their cytoplasm, which stain brightly with eosin dye.
Step 5: Identify lymphocytes as small white blood cells characterized by a large, round nucleus that occupies most of the cell volume, leaving only a thin rim of cytoplasm, which matches the description given.
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