Learning Objectives Explain how leukocytes migrate from peripheral blood into infected tissues Explain the mechanisms by which leukocytes recognize pathogens Explain the process of phagocytosis and the mechanisms by which phagocytes destroy and degrade pathogens Several of the cell types discussed in the previous section can be described as phagocytes—cells whose main function is to … Continue reading 18.4 Pathogen Recognition and Phagocytosis