the blood system

artery basophil biology blood body bone cell circulation count disease elements eosinophil erythrocytes granulocyte health heart hemocytoblast hemoglobin human illness immune leukocyte lymphoblast lymphocyte macrophage marrow medical medicine megakaryocyte microbe microbiology microscope monocyte neutrophil normoblast organ platelets red science set stream structure system table thrombocytes type vascular vector white