When a person suffers from a marked fall in blood pressure, it is helpful to administer to him the following hormone

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Insulin

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Thyroxine

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Adrenaline

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Solution

The correct option is C Adrenaline

The hormones adrenaline (epinephrine) and norarenaline (norepinephrine), secreted by the adrenal medulla, have the same effect as the sympathetic stimulation, i.e. they increase the heart rate.
Together they potentiate the fight and flight response by:
1) Increasing blood pressure
2) Increasing heart rate
3) Increasing metabolic rate

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