Medical Genetics There are two cellular components: (1)the phagocytic system, whose function is to ingest and digest invading microorganisms, and (2) natural killer(Nk) cells, whose function is to kill some tumors, microorganisms, and virally infected cells. The soluble components consist of complement proteins, acute phase reactants, and cytokinesMedical Genetics There are two cellular components: (1)the phagocytic system, whose function is to ingest and digest invading microorganisms, and (2) natural killer (NK) cells, whose function is to kill some tumors, microorganisms, and virally infected cells. The soluble components consist of complement proteins, acute phase reactants, and cytokines