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

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 ...

To explore possible treatments for various diseases, either animal models or human cell cultures are usually used first; ...

Tests in healthy mice showed that the system could track changes in retinal oxygenation in response to different inhaled oxygen levels. The measurements also matched systemic blood oxygen saturation, ...