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

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 ...

Blood and its components can be transported safely using drones by following standard guidelines, which can be particularly helpful in ensuring the availability of blood in emergencies across ...

Medically reviewed by Daniel Combs, MD Key Takeaways Getting less than six hours of sleep a night can increase your risk of high blood pressure (hypertension).It does so by affecting your body's ...