Double circulation - This system allows the blood to pass through the heart twice , Blood vessels - In a closed system the blood is also encased in these , cardiac muscle - This Tissue causes the contractions in the heart , Blood mixing - The Septum prevents this from happening within the heart, Exitation wave - This wave induces contractions of the cardiac muscle, Atria - These chambers are thin walled, ventricles - These chambers require force to pump blood around the body, Triscupid - this valve is found between the right Atrium and right Ventricle, cusps - These open and close the flow of blood within the heart, Mediastinum - The heart can be found in this space of the body,

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