Internal heart anatomy. Cutaway artwork revealing the four internal heart chambers and the heart valves and tendons (white). The two upper chambers are the atria. The two bottom chambers are the ventricles. This view is from the front. Blood arrives in the right atrium (upper left), is passed to the right ventricle (lower left) and is pumped to the lungs. After oxygenation in the lungs, the blood arrives back in the left atrium (upper right) and passes to the left ventricle (lower right), which pumps it round the body. Across top are the heart's major blood vessels. This artwork also shows a partial view of some of the coronary arteries.
Science Photo Library was founded in 1981 by Michael Marten, one of the authors of "Worlds Within Worlds", a book exploring different ways to observe the universe - from electron micrographs, to images of earthrise taken from the Apollo spacecraft. When Marten started receiving requests for the beautiful images in the book, he had an idea of setting up Science Photo Library.
Since then, Science Photo Library has continued to work alongside world acclaimed photographers and the leading science and medical experts to provide a central source of the best science and specialist imagery available. Although the collection started with scientific images, it has grown to encompass all aspects of science and their impact on everyday life.
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