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| Description: A. In the awake individual, muscle tone maintains an open airway against negative pressure during inspiration. B. When the individual is asleep, the tongue, soft palate, and oropharyngeal walls collapse, closing off the airway. C. Positive pressure, supplied by CPAP, acts as a splint to keep the airway open regardless of the sleeper’s position. Figure A shows a person sitting upright. Their hard and soft palate, tongue, and oropharyngeal wall all extend father back than they should, but do not completely block the airway, so air goes from the nose down the airway. Figure B shows the person lying down. Now these parts of the face block the airway, preventing air from going from the nose through the airway. In the figure C, the person is using a C pap machine, which is a mask that forces the air through the airway. Picture Stats: Views: 23 Filesize: 177.88kB Height: 658 Width: 2121 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=49789 |