T₃ and T₄

Question

T₃ and T₄
A) stimulate the adenohypophysis to secrete TSH.
B) regulate the basal metabolic rate (BMR).
C) stimulate osteoclastic activity, thereby elevating plasma calcium levels.
D) All of the above are true.

Accepted Answer

T₃ and T₄ primarily regulate the basal metabolic rate (BMR), which is the amount of energy the body uses at rest. They do not directly stimulate the adenohypophysis to secrete TSH or stimulate osteoclastic activity to elevate plasma calcium levels.