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A study in rats showed that male and female hearts respond differently to a stress hormone called noradrenaline.
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It was observed how the mouse's heart responded to hormones and neurotransmitters in real-time.
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The rats were exposed to noradrenaline, also known as norepinephrine.
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Noradrenaline is both a neurotransmitter and hormone associated with the body's "fight or flight" response.
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The researchers were interested in looking at factors that may contribute to arrhythmias.
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Arrhythmia is a type of heart disorder where the electrical impulses that control the heartbeat do not work properly.
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