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|[[File:HeartChambers.png|center|300px]]

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| style="height:20px; width:300px; text-align:center;" |A [[diagram]] showing the 4 chambers of the [[heart]].

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: [[Deoxygenated]] [[blood]] enters the [[Right Atrium|right atrium]]. The [[atria]] contract, pushing the [[blood]] from the [[Right Atrium|right atrium]] into the [[Right Ventricle|right ventricle]]. The [[ventricle]]s contract pushing the [[blood]] out of the [[Right Ventricle|right ventricle]] towards the [[lung]]s. [[Oxygenated]] [[blood]] returns from the [[lung]]s and enters the [[Left Atrium|left atrium]]. The [[atria]] contract, pushing the [[blood]] from the [[Left Atrium|Left atrium]] into the [[Left Ventricle|Left ventricle]]. The [[ventricle]]s contract pushing the [[blood]] out of the [[Left Ventricle|Left ventricle]] to the rest of the body.

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| style="height:20px; width:600px; text-align:center;" |A computer generated animation of the [[heart]] pumping.