Immune cells act as soldiers to defend our bodies from invaders such as viruses and foreign bodies. Different immune cells play different roles in a human’s immune system.
The immune system is the foundation of a healthy body, for it helps to fight off diseases and remove cells that fail to function normally. The ability of the immune system to protect the body against new threats, by generating and activating new immune cells, declines rapidly with age. The immune system is typically categorized into two systems; innate and adaptive. Both systems work closely together and take on different tasks.