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1.The heart's cardiac impulse is responsible for the heartbeat.
心脏的心动是心跳的原因。
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2.During exercise, the cardiac impulse increases to support the body's needs.
运动时，心脏的心动增加以支持身体的需求。
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3.Atrial fibrillation is a condition where the cardiac impulse is irregular.
房颤是一种心动过速的情况。