Identifying white blood cells by nuclear and cytoplasmic features

Steps:

• Examine cell 1: multi-lobed nucleus and granular cytoplasm indicate neutrophil.
• Examine cell 2: large size, irregular nucleus, and abundant cytoplasm suggest macrophage.
• Examine cell 3: round nucleus occupying most of cell with scant cytoplasm points to lymphocyte.
• Match features to standard photomicrograph labels for white blood cells.

Why C is correct:

• Option C accurately assigns neutrophil (multi-lobed nucleus), macrophage (large, amoeboid shape), and lymphocyte (high nucleus-to-cytoplasm ratio) based on histological definitions.

Why the others are wrong:

• A misidentifies monocyte (kidney-shaped nucleus) as neutrophil and lacks macrophage.
• B confuses monocyte with neutrophil and macrophage with monocyte, ignoring size differences.
• D uses vague "phagocyte" term instead of specific cell types and swaps lymphocyte with monocyte.

Final answer: C