Before the Discovery of These Glands, Thyroid Surgery Often Led

Multiple Choice

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