Homeostatic regulation of glucose.
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   When  blood glucose level rises, the pancreas secretes insulin hormone
   into the blood.
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   Insulin  enhances  the  transport  of  glucose  into  body  cells  and
   stimulates the liver and muscle cells to store glucose as glycogen.
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   When  blood  glucose  level  drops,  the pancreas secretes the hormone
   glucagon, which opposes the effect of insulin.
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   Glucagon  promotesthe breakdown ofglycogen in theliver and the release
   of glucose into the blood, increasing blood glucose level