STEVIE GRAND / SCIENCE PHOTO LIBRARY STEVIE GRAND / SCIENCE PHOTO LIBRARY
A patient in hospital being monitored for apnoea (cessation of breathing). The equipment on the left of the picture records heart rate and breathing rate; an alarm sounds if dangerous irregularities occur. Apnoea may develop if the respiratory control centres in the brainstem are damaged, by a stroke or a head injury, for example.
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