Scientists investigated the effect of diabetes on the control of heart rate in response tochanges in blood pressure in rats.The scientists found the mean changes in heart rates of healthy rats and rats with diabetesin response to rises or falls in blood pressure.The diagram shows their results in the form they were presented.Diabetes can damage the nervous system. The response of the rats with diabetes isdifferent from the response of the healthy rats. Use your knowledge of the control of heartrate by the nervous system to suggest an explanation for these results.

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