Learn about Breathing in this educational video from dizzo95.
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Male Speaker: The body is breathing apparatus is enclosed in an expansile bony cage formed by the ribs, the spinal column and the sternum. The flow of the cage is closed by the muscular diaphragm. Air passes down the wind pipe or trachea to enter the lungs during inspiration or inhaling the diaphragm moves downward and becomes flatter and the rib cage expands, this creates a partial vacuum in the lungs and to equalize the pressure air is drawn in. Expiration or exhaling is passive. The lungs have elastic tissue in their walls and during inspiration this is stretch in expiration its natural recoil causes the lungs to partially deflate.