Ventricle, This type of chamber can empty due to the fact that is two valves (1), Atria, The type of chamber with thinner muscular walls (1), Aorta, Left ventricle empties into this vessel (1), SL valve, A type of valve present both in the heart and veins to prevent backflow (2-abrev), Left AV valve, The valve which has to undergo the most pressure in the heart and is thus most likely to fail (3-abrev), Bundle of his, Conductive fibres in the heart surrounded by non-conductive septum (3), Purkinje fibres, Conductive fibres which span from the bottom to the top f the ventricles (2), Ventricular systole, Stage of the cardiac cycle in which it empties (2), Refractory period, Period in which nerves will not respond to signals sent to them (2).

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