ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Defective heart valve being held by a surgeon's gloved hands after being removed from a patient's heart. The valve will be replaced by an artificial heart valve. Heart valves control the flow of blood into and out of the heart, and between the chambers of the heart. Heart valve failure can be life threatening.
Model release not required. Property release not required.