Microcheck 156

The process of phagocytosis includes chemotaxis, recognition and attachment, engulfment, fusion of the phagosome with the lysosome, destruction and digestion of the ingested material, and exocytosis. Macrophages are long-lived phagocytic cells that are always present in tissues; they can be activated to enhance their killing power. Neutrophils are highly active, short-lived phagocytic cells that must be recruited to the site of damage.

■ How does a phagolysosome differ from a phagosome?

■ What could a microorganism do to avoid engulfment?

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