chemical messengers secreted by glands into the blood
a homeostatic control center, it controls the pituitary gland and serves as a biological clock
specific tissue acted on by each hormone
a sensory nerve ending that receives information about a stimulus
any of the glands of the endocrine system that secrete hormones directly into the bloodstream
the endocrine system's most influential gland. Under the influence of the hypothalamus, this gland regulates growth and controls other endocrine glands.
lipid molecule with four fused carbon rings
Local hormones derived from lipid molecules