Second Line of Defense

This line of defense uses enormous number of cells and chemicals to protect itself. It mainly relies on phagocytes, natural killer cells, and inflammatory response.

• Phagocytes engulf foreign particles.
• Natural killer cells police the body in blood and lymph are a unique group of lymphocytes that can lyse and kill cancer cells amd virus-infected body cells.
• Inflammatory response is a nonresponse that is triggered whenever body tissues are injured.