red blood cells flowing through a vein or artery. on a blue background.

illustration red blood cells vein artery blue background medical textbooks presentations articles circulatory system health anatomy physiology hematology vascular biology microscopy science education bloodstream oxygen transport hemoglobin platelets capillaries arteries veins diagnosis medicalart biomedical research visualization clinical medicalillustration lifescience biotechnology healthcare medicaleducation bloodflow cellstructure bloodvessels humanbody medicalscience redbloodcells ai generated