The<unk> <unk>  for short) is part of the endocrine system responsible for the regulation of metabolism.
As its name suggests, it depends upon the hypothalamus, the<unk>  gland, and the<unk>  gland.
The hypothalamus senses low circulating levels of<unk>  hormone and responds by releasing thyrotropin releasing hormone (TRH). The TRH stimulates the<unk>  to produce<unk>  stimulating hormone (TSH). The TSH, in turn, stimulates the<unk>  to produce<unk>  hormone until levels in the blood return to normal.
Hypothalamic-pituitary-thyroid axis
Hypothalamic pituitary adrenal axis
Parasympathetic nervous system
Endocannabinoid system
Autonomic nervous system
Sympathetic nervous system
Vestibular system
Renin-angiotensin system