<prompt> Complement responsible for activation of bacterial lysis is -c3ac3bc9c5a  <response>: The MAC, which is made up of multiple copies of the final component C9, kills bacteria especially thin-walled Neisseria by creating pores that disrupt the osmotic balance. C3a and C5a - cause vasodilation and increased vascular permeability C3b used for opsonisation C5a also has an impoant role in chemotaxis. ref robbins 9e pg 50_53 