blood cells. red blood cells, white blood cells, and

anatomy antibody artery bacteria basophil biology blood bloodcell body care cell cells cgi clinic count death diagram disease drug elements eosinophil erythrocyte genetic health healthy heart hemoglobin human illness illustration immune inflammation leukocyte leukocytes lymphocyte macrophage medical medicine microbe microbiology microscope microscopic monocyte neutrophil patient phagocyte plasma platelet platelets protection red school science scientific serum set stem structure system therapy thrombocyte thrombocytes type vascular vector vein vessel white