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52.6 x 23.6 cm ⏐ 20.7 x 9.3 in (300dpi)
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NICOLLE R. FULLER / SCIENCE PHOTO LIBRARY NICOLLE R. FULLER / SCIENCE PHOTO LIBRARY
Illustration of a cross-section through the upper respiratory tract of a patient with sleep apnoea. Sleep apnoea is a lack of oxygen caused by a patient's muscles relaxing and restricting the airways during sleep. It results in interrupted breathing that frequently wakes the patient and is a cause of snoring. Sleep apnoea is treated by the patient wearing a continuous positive airway pressure (CPAP) device while sleeping to maintain the airway.
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