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Exhalation
 
 
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Exhalation (or expiration) is the movement of air
AIR

Air is the part of Earth's atmosphere that humans breath and as such Air .Air may also refer to:...
 out of the bronchial tubes, through the airway
Airway

The airways are those parts of the respiratory system through which air flows, to get from the external environment to the alveoli.The airway begins at the mouth or nose, and accesses the vertebrate trachea via the pharynx....
s, to the external environment during breathing out.

Exhaled air is rich in carbon dioxide
Carbon dioxide

Carbon dioxide is a chemical compound composed of two oxygen atoms covalent bond to a single carbon atom. It is a gas at standard temperature and pressure and exists in Earth's atmosphere in this state....
, a waste product of cellular respiration
Cellular respiration

Cellular respiration is the set of the metabolism reactions and processes that take place in organisms' cell s to convert Energy from nutrients into adenosine triphosphate , and then release waste products....
 during the production of ATP
Adenosine triphosphate

This article is about the chemical used by cells as an energy carrier. For other uses, see ATP .Adenosine-5'-triphosphate is a multifunctional nucleotide, and plays an important role in cell biology as a coenzyme that is the "molecule unit of currency" of intracellular energy transfer....
.

Exhalation has a complementary relationship to inhalation
Inhalation

Inhalation is the movement of air from the external environment, through the air ways, and into the alveoli.Inhalation begins with the onset of contraction of the diaphragm , which results in expansion of the intrapleural space and an increase in negative pressure according to Boyle's Law....
; the cycling between these two efforts define respiration.








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Exhalation (or expiration) is the movement of air
AIR

Air is the part of Earth's atmosphere that humans breath and as such Air .Air may also refer to:...
 out of the bronchial tubes, through the airway
Airway

The airways are those parts of the respiratory system through which air flows, to get from the external environment to the alveoli.The airway begins at the mouth or nose, and accesses the vertebrate trachea via the pharynx....
s, to the external environment during breathing out.

Exhaled air is rich in carbon dioxide
Carbon dioxide

Carbon dioxide is a chemical compound composed of two oxygen atoms covalent bond to a single carbon atom. It is a gas at standard temperature and pressure and exists in Earth's atmosphere in this state....
, a waste product of cellular respiration
Cellular respiration

Cellular respiration is the set of the metabolism reactions and processes that take place in organisms' cell s to convert Energy from nutrients into adenosine triphosphate , and then release waste products....
 during the production of ATP
Adenosine triphosphate

This article is about the chemical used by cells as an energy carrier. For other uses, see ATP .Adenosine-5'-triphosphate is a multifunctional nucleotide, and plays an important role in cell biology as a coenzyme that is the "molecule unit of currency" of intracellular energy transfer....
.

Exhalation has a complementary relationship to inhalation
Inhalation

Inhalation is the movement of air from the external environment, through the air ways, and into the alveoli.Inhalation begins with the onset of contraction of the diaphragm , which results in expansion of the intrapleural space and an increase in negative pressure according to Boyle's Law....
; the cycling between these two efforts define respiration.

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