This is the body's first line of defense and consists of all mucosal and epithelial cells (aka "skin"). Not just the skin on the “outside” of your body, because technically speaking, the respiratory and digestive systems are external as well.
This system is the first response to a cut on your arm, airborne or ingested pathogens, or viruses brought home from daycare. The body quickly and immediately, through inflammation, dispatches an array of immune cells like Natural Killer Cells and Phagocytes to identify, destroy, and remove the toxic invader. This incredible process happens in our bodies on a daily basis.*