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1 Microbe adheres to phagocyte.

2 Phagocyte forms pseudopods that eventually engulf the particle.

Lysosome

Phagocytic vesicle containing antigen (phagosome).

3 Phagocytic vesicle is fused with a lysosome. Phagolysosome

Acid hydrolase enzymes

4 Microbe in fused vesicle is killed and digested by lysosomal enzymes within the phagolysosome, leaving a residual body.

Residual body

5 Indigestible and residual material is removed by exocytosis.

(b)

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings

Figure 21.2b

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