Four Components of Blood

platelets

cell fragments that assist in blood clotting. There are 300,000 platelets per microliter of blood

Red Blood Cells (RBCs)

the most numerous type of blood cell. RBCs carry Oxygen and Carbon Dioxide gases which bind to the hemoglobin protein to the RBC.

White Blood Cells (WBCs)

belong to the circulatory system, but they are also part of the immune system. The WBC are the only blood cell that contains a nucleus and DNA

Plasma

the liquid part of blood that carries nutrients and hormones throughout the body. Plasma makes up about 55% of blood tissue.