Red blood cells carry oxygen from the lungs around the body. They then carry carbon dioxide from around the body back to the lungs. These cells are an important component of blood. However, a range of ...

The blood-brain and blood-retinal barriers are protective systems that prevent harmful substances from entering the brain and ...

Stem cells are precursors of a variety of different cells: They can turn into anything from blood to bone to muscle. Human blood stem cells, known as hematopoietic stem cells, are the forerunners of ...

A high red blood cell count can occur for many reasons, including excessive cell production, changes in blood volume, or underlying medical conditions. Sometimes, the cause is unknown. Erythrocytes, ...