Once the pathogen has entered the body.
Phagocytes engulf and destroy the pathogen by phagocytosis
Neutrophill - multi-lobed nucleus, made in the bone marrow, short-life span, found on lung suface and can move out of capillaries into tissue fluid.
Macrophage - C-shaped mass nucleus, made in bone marrow, long-lived, become antigen-presenting cells to trigger a specific immune response, settle in organs and lymph nodes.
Antigens are chemical markers on the pathogen that the body recognises as foreign. Opsonins (antibodies) produced by the body attach to the antigen which the phagocytes recognise.
antibodies bind to the surface receptiors on its plasma membrane, pathogen is engulfed by phagocytosis, enzymes digest the pathogen and then products are absorbed.
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