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a hollow muscular organ that pumps the blood through the circulatory system by rhythmic contraction and dilation. In vertebrates there may be up to four chambers (as in humans), with two atria and two ventricles|the speed of the heartbeat measured by the number of contractions of the heart per minute.|the fact or power of enduring an unpleasant or difficult process or situation without giving way.|a rhythmical throbbing of the arteries as blood is propelled through them, typically as felt in the wrists or neck.|relating to the heart and blood vessels.|the state of being free from illness or injury.