most abundant red blood cells

are only complete cells , immune systems white blood cells

platelets are small, colorless cell fragments that participate in blood clotting

are roughly disc shaped

process that dissolves the blood. The enzyme plasmin hydrolyzes or breaks fibrin and dissolves the clot.

blood cell formation occurring in the red bone marrow

Stem cells where the formed elements of the blood are derived and are located in the bone marrow.

hormone secreted by the kidneys that stimulate stem cells at the red bone marrow to develop into red blood cells.

a glycoprotein hormone produced by the liver and kidney which regulates the production of platelets at the red bone marrow