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'''Breathing''' takes [[oxygen]] in and [[carbon dioxide]] out of the body. [[Aerobic]] organisms require oxygen to create energy via respiration]], in the form of energy-rich [[molecule]]s such as [[glucose]]. The medical term for normal relaxed breathing is eupnea.
'''Breathing''' takes [[oxygen]] in and [[carbon dioxide]] out of the body. [[Aerobic]] organisms require oxygen to create energy via respiration]], in the form of energy-rich [[molecule]]s such as [[glucose]]. The medical term for normal relaxed breathing is eupnea.
<center>For lessons on the [[topic]] of '''''[[Breath]]''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Breath this link].</center>
==Gas exchange==
==Gas exchange==
Breathing is only part of the processes of delivering [[oxygen]] to where it is needed in the body and removing [[carbon dioxide]] waste. The process of [[gas exchange]] occurs in the alveoli by passive diffusion of gases between the alveolar gas and the blood passing by in the lung capillaries. Once in the blood the [[heart]] powers the flow of dissolved gases around the body in the circulation.
Breathing is only part of the processes of delivering [[oxygen]] to where it is needed in the body and removing [[carbon dioxide]] waste. The process of [[gas exchange]] occurs in the alveoli by passive diffusion of gases between the alveolar gas and the blood passing by in the lung capillaries. Once in the blood the [[heart]] powers the flow of dissolved gases around the body in the circulation.
