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To [[inhale]] the [[diaphragm]] [[contract]]s and goes down while the [[Intercostal Muscle|intercostal muscles]] [[contract]] pulling the [[Rig Rib Cage|ribs]] upwards and outwards.
To [[exhale]] the [[diaphragm]] relaxes and goes up while the [[Intercostal Muscle|intercostal muscles]] relax allowing the [[Rig Rib Cage|ribs]] to go down and inward.
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