It’s the study of diseases and disorders affecting blood cells, their production, and any organs and tissues involved in hematopoiesis such as bone marrow, the spleen and the thymus ( hope that helps you out a little )
<h3><u>Mark Everett Sloan, M.D., F.A.C.S. is a fictional character from ABC's medical drama television series Grey's Anatomy, portrayed by Eric Dane. Created by showrunner Shonda Rhimes, the character was introduced in season two as Derek Shepherd's best friend. </u></h3>
