veins blood vessels normal flow and blocked veins blood vessels flow

diseases fats body heart human pain system science flowing vein routine care health collateral hemorrhage varicose valves endothelium plaque aneurysm angioplasty stenosis dilation constriction hemostasis hemodynamics vasculature perfusion capillaries circulation embolism thrombosis atherosclerosis clotting occlusion normal vector cardiovascular artery cholesterol clot blockage vascular arteries flow vessel blood veins vessels blocked venis flow graphic design