IMMUNOLOGY

Detailed explanation-1: -C5b-C9, termed the complement membrane attack complex is responsible for the cytolytic function of complement, a potent mechanism contributing to innate defence against pathogens.

Detailed explanation-2: -The C5b fragment binds with C6, C7, C8 and multiple units of C9 in the membrane, forming C5b-9, also known as the membrane attack complex (MAC), in the cell membranes of cells and microorganisms to cause cell lysis.