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 ...

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 ...

Blood disorders are conditions that impact the blood’s ability to function correctly. Symptoms depend on the type of blood disorder. However, some common symptoms include unexplained fatigue and ...