Imagine bacteria adhering to the surface of a cell, perhaps at the site of an injury or wound. In response, a white blood ...

They are responsible for ingesting, killing, and digesting harmful pathogens like viruses or bacteria. The body's level of ...

Before bacteria can multiply and cause symptoms, the immune system can typically kill them. White blood cells (WBCs) attack harmful bacteria — even if symptoms occur, the immune system can ...

Penicillin flowing through the bloodstream rapidly kills the bacteria. But it cannot penetrate ... the body began responding on its own. White blood cells, the hunter-killers of the immune system ...

And your white blood cells are like police looking for germs. There's a lot going on inside you! Blood transports materials around the body and protects against disease. It contains: ...

your immune system can effectively fight off these germs. But sometimes they overpower your body's natural defenses and invade your lungs. In response, your body produces white blood cells to ...