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===Meaning===
The [[Breathing System]] is an [[Organ System|organ system]], used to [[Absorb (biology)|absorb]] [[Oxygen]] into the [[blood]] and remove [[Carbon Dioxide]] from the [[blood]].
===About the Breathing System===
: [[Breathing System]]s are found in [[Amphibian]]s, [[Bird]]s, [[Mammal]]s and [[Reptile]]s.
: The [[Breathing System]] is specially [[Adaptation|adapted]] to exchange [[Absorb (biology)|absorb]] [[Oxygen]] into the [[blood]] and remove [[Carbon Dioxide]] from the [[blood]] as quickly as possible.
The parts in the [[Breathing System]] that you should know:
*[[Mouth]]
*[[Trachea]]
*[[Bronchus|Bronchi]] and [[Bronchiole]]s
*[[Lung]]s
*[[Alveolus|Alveoli]]
*[[Rib Cage|Ribs]] and [[Intercostal Muscle]]s
*[[Diaphragm]]
{| class="wikitable"
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|[[File:BreathingSystemDiagram.png|center|400px]]
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| style="height:20px; width:400px; text-align:center;" |A diagram showing the parts of the human [[Breathing System]].
|}
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 [[Breathing|breath]] the [[lung]]s must be able to take in new [[air]] and release the old [[air]].
: When the [[lung]]s take in [[air]] this is called [[Inhale|inhalation]].
: When the lungs get rid of old air this is called [[Exhale|exhalation]].
{| class="wikitable"
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|[[File:Breathing.png|center|400px]]
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| style="height:20px; width:400px; text-align:center;" |
: To [[inhale]] the [[diaphragm]] [[contract]]s and goes down while the [[Intercostal Muscle|intercostal muscles]] [[contract]] pulling the [[Rib Cage|ribs]] upwards and outwards.
: To [[exhale]] the [[diaphragm]] relaxes and goes up while the [[Intercostal Muscle|intercostal muscles]] relax allowing the [[Rib Cage|ribs]] to go down and inward.
|}
{| class="wikitable"
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|[[File:Breathing.gif|center]]
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| style="height:20px; width:400px; text-align:center;" |An animation of the lungs inhaling and exhaling.
|}