Before the discovery of these glands, thyroid surgery often led to a rapid drop in blood calcium levels, which triggered muscle contractions and cardiac arrhythmias. What glands are these and which hormone is lacking?
A) thyroid glands; calcitonin
B) parathyroid glands; calcitonin
C) parathyroid glands; parathyroid hormone
D) thyroid glands; levothyroxine
E) parathyroid glands; levothyroxine
Answer: C
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