How are hormone levels regulated?
A. An endocrine gland can respond to the blood level of the hormone it produces.
B. A product can trigger hormone production; the hormone can then reduce the amount of product which in turn reduces the level of hormone.
C. A hormone can trigger a second gland to secrete a hormone that dampens production of the first hormone.
D. A second contrary hormone can counteract the effect of the first hormone.
E. All of the choices are correct.
Answer: E
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