If a Pathogen Passes the Initial External Defences and Invades

If a pathogen passes the initial external defences and invades the body

A) internal specific defence mechanisms are activated.
B) interleukin-2 is produced by natural killer cells to expand the initial response.
C) monocytes release perforins which punch holes in the membranes of infected cells.
D) phagocytic cells engulf particles and kill the invading organisms.
E) macrophages are attracted to the site of infection and activate the complement cascade.

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