• Inhaling and exhaling may seem like simple actions, but they are just part of the complex process of respiration, which includes these four steps.
  • Respiration begins with ventilation, which is the process of moving air in and out of the lungs.
  • After the blood in the pulmonary capillaries becomes saturated with oxygen, it leaves the lungs and travels to the heart.
  • When breathing is too slow, blood contains too much carbon dioxide and becomes too acidic.
  • Gas exchange is also needed to carry away waste of the blood.
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