Plasma makes up about 55 percent of your blood. It carries out several key functions in the body, including transporting waste products. Read on to learn more about plasma, including what it’s made of ...

Lymphocytes are white blood cells that help the body fight infection and disease. The healthy range for an adult is between 1,000 and 4,800 lymphocytes per microliter (µL) of blood. Doctors will ...

Red blood cells are important mediators of the innate immune system. Depending on the cellular environment, these cells either activate the immune system or maintain the system in a dormant state. In ...