A new, fast and easy test could revolutionize blood transfusions, giving blood centers and hospitals a reliable way to ...

A new kind of microscope is giving scientists a way to watch life inside cells with a clarity that feels almost unfair.

Red blood cells transport oxygen throughout your body, including to vital organs and tissues. They also help your body get rid of carbon dioxide. Too little or too many red blood cells may be ...

The circulatory system consists of one heart, five liters of blood, and approximately 96,000 kilometers of blood vessels, responsible for transporting nutrients and waste throughout the body. Water ...