The parathyroid glands secrete a hormone that regulates the level of what substance in the blood?
A) calcium
B) insulin
C) melanin
D) melatonin
A
Explanation: A) Correct! Parathyroid hormone moves calcium from the bones to the blood.
B) The parathyroid glands do not secrete insulin.
C) The parathyroid glands do not secrete melanin.
D) The parathyroid glands do not secrete melatonin.
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