Answer:
Muscular system.
Step-by-step explanation:
The hormones may be defined as the chemical messenger of the body and maintains the body homeostasis. The pituitary gland is the master gland of the body.
The atrophy and hypertrophy of the muscular system is regulated by the levels of the growth hormones and testosterone in the body. The muscle atrophy is decrease in the muscle mass that can cause weakness and hypertrophy is increase in the muscular mass due to the variation of the hormones in the body.
Thus, the answer is muscular system.