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The most active phagocytic white blood cells are neutrophils and monocytes which modulate the innate immune response and phagocytose infection agents. Neutrophil has a lobed nucleus and granular cytoplasm. Neutrophils engulf bacteria and release various substances such as lysozyme and oxidising agents. Monocyte is the largest form of WBC in vertebrates. It has a kidney shaped nucleus and is actively phagocytic, ingesting bacteria and cell’s debris.

1. Neutrophils and monocytes are phagocytic WBCs.
2. Neutrophils release lysozyme and oxidising agents.
3. Monocytes have a kidney-shaped nucleus.
4. All of the above.

Correct answer: All of the above.

Solution

The passage states that neutrophils and monocytes are phagocytic white blood cells, that neutrophils release lysozyme and oxidising agents, and that monocytes have a kidney-shaped nucleus. Since A, B, and C are all true, the correct choice is the option that includes all of them.

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