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Biology, 03.08.2019 05:30 codylowery5635
In response to low levels of calcium, the parathyroid glands release a hormone that dissolves some of the calcium in the bones, moving it into the blood. this is an example of a) a positive feedback loop, because a condition in the body causes an increase in a hormone. b) a positive feedback loop, because the low level of calcium in the blood is returned to normal. c) a negative feedback loop, because increased calcium levels cause the parathyroid glands to release less hormone. d) a negative feedback loop, because the amount of calcium in bone decreases as a result of the parathyroid hormone. eliminate
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