Immune system structures:

The immune system protects the body from potentially harmful substances. The inflammatory response (inflammation) is part of innate immunity. It occurs when tissues are injured by bacteria, trauma, toxins, heat, or any other cause.
- Reviewed last on: 11/6/2006
- Sandra W. Cohen, M.D. Private Practice specializing in geriatrics, Brooklyn, NY. Review provided by VeriMed Healthcare Network.