GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
Heart valves, artwork. The heart is divided into chambers called ventricles and atria, separated by valves. The valves are flaps that prevent backflow of blood during various contraction cycles. The flaps are attached to the ventricle walls by string-like tendons (heart strings).
Model release not required. Property release not required.