In the cold environment, the human body plays an important role in the regulation of the hormone is ( ) A. insulin B. glucagon C. thyroid hormone D. growth hormone

A, insulin's role is to promote the tissue cells to take up, use and storage of glucose, making the blood glucose concentration lower, A error;

B, glucagon can promote the breakdown of hepatic glycogen and non-glycogen conversion, so that the concentration of blood glucose increased, B error;

C, cold, the secretion of thyroid hormone increases, improve the metabolism of the cells to increase the level of heat production, and thus maintain a relatively constant body temperature, and the growth hormone. The body temperature is relatively constant,

D, growth hormone can promote growth, especially to promote protein synthesis and bone growth,

D error.

Therefore, the choice: C.

The growth hormone can promote growth, especially protein synthesis and bone growth, D error.