Immune response: MedlinePlus Medical Encyclopedia

Immune system immune system The immune system is comprised of an intricate network of lymphoid and nonlymphoid cells communicating via molecular messengers to provide surveillance against digestive system If you're often sick, feel fatigued or have other nagging symptoms you can't figure out, you may have a weakened immune system

excretory system To be immune means to be protected So it makes sense that the body system that helps fight off sickness is called the immune system The immune