Human bodies make 2 million red blood cells per second. They each live for 120 days and spend that time zooming completely around the body every 20 seconds, carrying oxygen from the lungs to other ...

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 ...

In healthy red blood cells (RBCs), myosin fibers (blue) contract, pulling on actin (pink) and spectrin proteins (purple) connected to the cell membrane and helping to give the cells their distinct, ...

Healthy fresh red blood cells have a distinctive biconcave—or dumbbell—shape for efficient oxygen release. During refrigerated storage, red cells become energetically stressed and more spherical, ...

Extreme endurance training is often seen as a sign of strong physical fitness. However, new research indicates that very long-distance runs may have negative effects on the body.

Running extreme distances may strain more than just muscles and joints. New research suggests ultramarathons can alter red blood cells in ways that make them less flexible and more prone to breakdown, ...