MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY
Exhalation. Computer artwork showing exhalation (breathing out). The diaphragm, a muscular sheet between the chest and abdominal cavities, relaxes and moves upwards (red arrows). This decreases the volume of the lungs and increases their internal pressure, causing air (blue arrows) to be forced out of the lungs.
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