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Heart rate is controlled by the ( autonomic, sensory, central ) nervous system. The ( sympathetic, parasympathetic ) nervous system speeds up the heart rate and the ( parasympathetic, sympathetic ) slows it down. Changes are controlled by the medulla oblongata in the ( brain, heart, pancreas ). Changes occur due to chemical (by ( chemoreceptors, baroreceptors )) and pressure changes (by ( baroreceptors, chemoreceptors ))