Adaptive/ Specific Defense System

Specific or Adaptive defense system is often referred as the body's third line of defense.

This defense recognizes foreign molecules and acts to inactivate or destroy them.

• It is antigen specific- It recognizes and acts against particular pathogens or foreign substances.
• It is systemic- Immunity is nor restricted to the initial infection site.
• It has "memory"- It recognizes and mounts even stronger attacks on previously encountered pathogens.

Lymphocytes act directly by lysing foreign cells.
Lymphocytes act indirectly by releasing chemicals that enhance the inflammatory response or activate other immune cells.