DIAGRAM: GASTROINTESTINAL: GI: ARTERY: Pathogenesis of Atherosclerosis - 6 of 13; A=Lipoprotein, B=Granulocyte, C=Platelets, D=Macrophage --Macrophages may also injure the overlying endothelium, allowing platelets to attack and release growth factors, including PDGF. Some of the smooth muscle cells themselves may also f