The immune system is essential for our survival, keeping us healthy and fighting off pathogens from the environment. Without it, the body would be attacked by bacteria, viruses and parasites.

The immune system is essential for life, without the immune system, the body would be vulnerable to attack by bacteria, viruses, parasites, etc. The immune system keeps us healthy when exposed to pathogens. The immune system is located throughout the body and involves many types of cells, organs, proteins and tissues. It is important that the immune system can distinguish the body's own tissue from foreign tissue. Dead or damaged cells are also recognized and eliminated by the immune system.