Vomiting. Illustration of the mechanism that causes vomiting in the human body. An impulse from the front of the brain has stimulated the vomiting centre (green) in the brainstem. This sends nerve impulses to the stomach, diaphragm and abdominal wall. In response, the diaphragm (red line above stomach) pushes down, the abdominal wall presses inwards, and the bottom of the stomach constricts. The stomach contents are expelled up through the oesophagus and out of the mouth in a jet. Vomiting can be triggered by the digestive system, balance organs, and certain compounds in the bloodstream, such as alcohol. It can also occur as a purely psychological reaction of disgust.
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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If you're not happy with a purchase that you made on FineArtAmerica.com, for any reason, you can return it to us within 30 days of the order date. As soon as it arrives, we'll issue a full refund for the entire purchase price. Please note - Fine Art America does not reimburse the outgoing or return shipping charges unless the return is due to a defect in quality.