Which pairs of hormones have opposite effects?
A) testosterone and melatonin
B) progesterone and insulin
C) parathyroid hormone and calcitonin
D) oxytocin and prolactin

Question

Quizplus · Accepted Answer

Parathyroid hormone and calcitonin have opposite effects on blood calcium levels. Parathyroid hormone increases blood calcium levels by stimulating the release of calcium from bones and increasing reabsorption of calcium by the kidneys, while calcitonin decreases blood calcium levels by inhibiting bone resorption and increasing excretion of calcium by the kidneys.

Note: None of the other choices have opposite effects on physiological processes. Testosterone and melatonin have different effects on sexual development and circadian rhythms, respectively. Progesterone and insulin both have roles in regulating glucose metabolism. Oxytocin and prolactin both have roles in lactation and have some overlapping effects on reproductive physiology.

Which Pairs of Hormones Have Opposite Effects