Artificial heart valve before surgical implantation. The four heart valves prevent blood from re-entering each of the heart chambers once it has left. If one of these valves becomes narrowed or leaky,due to damage or disease for example,it must be replaced with a prosthetic valve | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Reeve, Antonia |
Bildgröße: | 4961 px × 3462 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |