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[[File:lighterstill.jpg]][[File:Space respiration.jpg|right|frame]]

[[File:lighterstill.jpg]][[File:Space respiration.jpg|right|frame]]

'''Respiration''' (or just [[breath]]ing) is defined as the transport of [http://en.wikipedia.org/wiki/Oxygen oxygen] from the outside air to the [[cells]] within [http://en.wikipedia.org/wiki/Tissue_(biology) tissues], and the transport of [http://en.wikipedia.org/wiki/Carbon_dioxide carbon dioxide] in the [[opposite]] direction. This is in contrast to the biochemical definition of respiration, which refers to [http://en.wikipedia.org/wiki/Cellular_respiration cellular respiration]: the metabolic [[process]] by which an [[organism]] obtains [[energy]] by reacting oxygen with glucose to give water, carbon dioxide and ATP (energy). Although physiologic respiration is [[necessary]] to sustain cellular respiration and thus life in [[animals]], the processes are distinct: cellular respiration takes place in [[individual]] cells of the animal, while physiologic respiration concerns the bulk [[flow]] and transport of metabolites between the [[organism]] and the external [[environment]].

'''Respiration''' (or just [[breath]]ing) is defined as the transport of [https://en.wikipedia.org/wiki/Oxygen oxygen] from the outside air to the [[cells]] within [https://en.wikipedia.org/wiki/Tissue_(biology) tissues], and the transport of [https://en.wikipedia.org/wiki/Carbon_dioxide carbon dioxide] in the [[opposite]] direction. This is in contrast to the biochemical definition of respiration, which refers to [https://en.wikipedia.org/wiki/Cellular_respiration cellular respiration]: the metabolic [[process]] by which an [[organism]] obtains [[energy]] by reacting oxygen with glucose to give water, carbon dioxide and ATP (energy). Although physiologic respiration is [[necessary]] to sustain cellular respiration and thus life in [[animals]], the processes are distinct: cellular respiration takes place in [[individual]] cells of the animal, while physiologic respiration concerns the bulk [[flow]] and transport of metabolites between the [[organism]] and the external [[environment]].

In unicellular organisms, simple [[diffusion]] is sufficient for gas exchange: every [[cell]] is constantly bathed in the external [[environment]], with only a short distance for gases to flow across. In contrast, [[complex]] multicellular animals such as humans have a much greater distance between the environment and their innermost cells, thus, a [http://en.wikipedia.org/wiki/Respiratory_system respiratory system] is needed for effective gas exchange. The respiratory system works in concert with a [http://en.wikipedia.org/wiki/Circulatory_system circulatory system] to carry gases to and from the tissues.

In unicellular organisms, simple [[diffusion]] is sufficient for gas exchange: every [[cell]] is constantly bathed in the external [[environment]], with only a short distance for gases to flow across. In contrast, [[complex]] multicellular animals such as humans have a much greater distance between the environment and their innermost cells, thus, a [https://en.wikipedia.org/wiki/Respiratory_system respiratory system] is needed for effective gas exchange. The respiratory system works in concert with a [https://en.wikipedia.org/wiki/Circulatory_system circulatory system] to carry gases to and from the tissues.

Respiratory [[behavior]] is correlated to the cardiovascular behavior to control the gaseous exchange between cells and blood. Both behaviors are [[Intensity|intensified]] by [[exercise]] of the [[body]]. However, respiratory is highly voluntary compared to cardiovascular activity which is [[totally]] involuntary.[http://en.wikipedia.org/wiki/Respiration_%28physiology%29]

Respiratory [[behavior]] is correlated to the cardiovascular behavior to control the gaseous exchange between cells and blood. Both behaviors are [[Intensity|intensified]] by [[exercise]] of the [[body]]. However, respiratory is highly voluntary compared to cardiovascular activity which is [[totally]] involuntary.[https://en.wikipedia.org/wiki/Respiration_%28physiology%29]

==See Also==

==See Also==

*[http://nordan.daynal.org/wiki/index.php?title=Paper_11_-_The_Eternal_Isle_of_Paradise#11:6._SPACE_RESPIRATION Space Respiration]

*[https://nordan.daynal.org/wiki/index.php?title=Paper_11_-_The_Eternal_Isle_of_Paradise#11:6._SPACE_RESPIRATION Space Respiration]

[[Category: Biology]]

[[Category: Biology]]