human respiration inhalation and exhalation |
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| navigate by keyword : air alveoli alveolus anatomy biology blood body bone breathe cavity circulation contract contracts decreases diaphragm downward exhalation exhale forced health human illustration increases inhalation inhale isolated lung lungs medical medicine muscle nasal organ people pressure pulls relaxes respiration result ribs sceleton science shape system thoracic trachea volume when while |
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| When the diaphragm contracts, it moves down towards the abdomen. This movement of the muscles causes the lungs to expand and fill with air, like a bellows inhalation. Conversely, when the muscles relax, the thoracic cavity gets smaller, the volume of the lungs decreases, and air is expelled exhalation. |
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