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Answer :
Final answer:
The first event when a pathogen is ingested by a phagocyte is its recognition and attachment which is facilitated by the pathogen being coated with a molecule such as a complement protein. This is followed by phagocytosis, where the pathogen is engulfed and brought into the phagocyte. Finally, the pathogen is destroyed in the phagolysosome by lysosomal enzymes.
Explanation:
When a pathogen is ingested by a phagocyte, the initial event is that the pathogen is recognized and attached by the phagocyte. This process is facilitated by the coating of the pathogen with a molecule such as a complement protein. After the initial recognition, the pathogen is engulfed in a vesicle and brought into the internal compartment of the phagocyte through a process called phagocytosis.
Within the phagocyte, the pathogen-laden vesicle fuses with a lysosome to create a phagolysosome, wherein the pathogen is degraded and ultimately destroyed by lysosomal enzymes. Notably, this process also involves the production of reactive oxygen species that are antibacterial.
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