Question

a researcher discovered a new hormone that raises blood calcium levels. according to the principles of negative feedback, this hormone would be secreted when
multiple choice
blood calcium levels increase.
blood calcium levels decrease.
blood calcium levels are stable.
blood calcium levels are elevated.
none of these choices are correct.

Explanation:

Negative feedback systems act to reverse deviations from a set point. A hormone that raises blood calcium would be secreted when calcium levels are too low, to bring them back to normal.

Answer:

blood calcium levels decrease.