From birth, humans are exposed to a continuous onslaught of bacteria, viruses, and other disease-causing organisms. Without an effective shield, a person would soon succumb to infectious diseases and cancer. In the battle with microbial invaders, protection is delivered through a complex array of defensive measures collectively identified as the immune system. A well-rounded lifestyle based on healthy eating habits and regular physical activity promotes good immune function and a lowered risk of infectious illness and chronic disease.

Innate and Acquired Immunities

The immune system is a remarkably adaptive defense entity. It is able to generate an enormous variety of cells and molecules capable of recognizing and eliminating a limitless variety of foreign invaders. There are 2 functional divisions: (1) innate immunity, which refers to the ...

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