Following a meal, a woman's blood glucose level has increased. In addition, her pancreas has increased the amount of insulin produced and released. Which of the following phenomena has occurred?
A)
Increased hormone level according to a negative feedback mechanism
B)
Adjustment according to the level of the substance a hormone regulates
C)
Hormone production and release via the positive feedback cycle
D)
Hypothalamic-pituitary control of hormone levels
Ans:
B
Feedback:
The level of some hormones is adjusted according to the amount of the substance that they control. In this case, insulin controls glucose levels and would increase in response to the increase in serum glucose that follows a meal. This differs from a negative feedback cycle in which a simple decrease in a hormone level stimulates production and/or release of that hormone. Positive feedback and hypothalamic-pituitary control are not evident in this situation.
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