The question asks which hormone is produced during stress and stimulates glycogenolysis in the liver. Let's examine the options:
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Thyroxin: This hormone is produced by the thyroid gland and is primarily responsible for regulating metabolism. It does not specifically initiate glycogenolysis during stress.
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Insulin: This hormone is produced by the pancreas and helps to lower blood glucose levels by promoting the uptake of glucose into cells. It is the opposite of what is needed during stress when glucose levels should be increased through glycogenolysis.
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Adrenaline: Also known as epinephrine, this hormone is released by the adrenal glands during stress. It stimulates glycogenolysis, which breaks down glycogen into glucose in the liver, thus increasing blood glucose levels to provide energy. This aligns well with the condition described in the question.
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Estradiol: This hormone is a form of estrogen and is involved in the reproductive system. It is not related to stress responses or glycogenolysis.
From the above, we can see that Adrenaline is the correct answer. During stress, adrenaline acts on the liver to stimulate glycogenolysis, providing extra glucose to the body for quick energy.
Therefore, the correct answer is:
Adrenaline