What Are White Blood Cells?
Reviewed: Dr. Gromatzky
If we cut ourselves, we give pathogens a way to get inside the body where they can do us some real harm. Some pathogens are also inhaled or ingested from the air, what we eat, and what we drink. They can also be transmitted from person to person in saliva and other bodily fluids.
With so many threats around us, we need a way to keep us safe, and this is where white blood cells come in. They form an important part of our immune system and perform a number of roles, most of which involve detecting and destroying unwelcome intruders.
