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 ...

Get to know the functions of your heart, blood vessels, and blood itself and how they work together to maintain your health.

Every two seconds someone in the U.S. needs a blood transfusion, according to the American Red Cross. “Blood transfusion is a highly critical, life-saving clinical procedure for a variety of patients, ...

Your immune system is a network of cells, tissues, and organs that fight off infection. Your immune system can be affected by ...

Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them. They help to connect your arteries and veins in addition to facilitating the exchange of ...