GENERAL HISTOLOGY

Detailed explanation-1: -The immune system’s three lines of defense include physical and chemical barriers, non-specific innate responses, and specific adaptive responses.

Detailed explanation-2: -The second line of defense is managerial and is responsible for oversight of the doers. They also develop and implement risk management processes, policies and procedures. The third line of defense are the auditors, both internal and external, who independently assess and report on the work of the other two lines.