Nausea and Vomiting Image on Healthline

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These illustrations depict the mechanism an...

These illustrations depict the mechanism and causes of vomiting in the human body. An impulse from the brain stimulates the vomiting center (top center) in the brain stem. Nerve impulses sent to the stomach, diaphragm, and abdominal wall (bottom center) result in stomach's contents being expelled. Other causes of vomiting include raised pressure in the skull due to injury or tumor (upper right), and hormonal changes during pregnancy. (Illustration by John Bavosi, Custom Medical Stock Photo. Reproduced by permission.)

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