• Inhaling is an active movement that results from the contraction of a muscle called the diaphragm.
  • The rate of breathing is regulated by the brain stem.
  • It monitors the level of carbon dioxide in the blood and triggers faster or slower breathing as needed to keep the level within a narrow range.
  • The opposite events occur when the level is too low and the excess carbon dioxide is released into the air.
  • The brain stem sends nerve impulses to the diafragm through the autonomic nervous system.
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