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Air enters the [[mouth]], travels down the [[trachea]], through one of the [[bronchi]], through a [[bronchiole]] and to an [[alveolus]]. [[Oxygen]] is transferred into the [[blood]] while [[Carbon Dioxide]] in the [[blood]] is transferred into the [[alveolus]].
===Breathing===
: To breath the lungs must be able to take in new air and release the old air.
: When the lungs take in air this is called inhalation.
: When the lungs get rid of old air this is called exhalation.
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|[[File:Breathing.png|center|400px]]
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: To inhale the diaphragm contracts and goes down while the intercostal muscles contract pulling the ribs upwards and outwards.
: To exhale the diaphragm relaxes and goes up while the intercostal muscles relax allowing the ribs to go down and inward.
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{| class="wikitable"
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|[[File:Breathing.gif|center|400px]]
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| style="height:20px; width:400px; text-align:center;" |An animation of the lungs inhaling and exhaling.
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