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4 votes
In the feedback system that maintains normal calcium ion levels in the blood,

how do the hormones produced by the thyroid and parathyroid glands
interact?
A. The thyroid controls the parathyroid.
B. One is a backup system for the other.
C. They have opposing effects.
D. They reinforce each other.

1 Answer

3 votes
Answer:

C. They have opposing effects
User Ksimon
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