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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Reeve, Antonia |
Taille de l’image : | 4961 px × 3462 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |