Valve mechanism in veins, illustration. Veins are blood vessels with relatively thin wall and with valves (flaps) that prevent the backflow (arrows) of deoxygenated blood as it is returned from the body to the heart-lung system. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Dalhoff, Henning |
Bildgröße: | 3661 px × 4843 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |