body system that includes internal organs that secrete hormones.
steroidal or amino acid based molecules released to the blood that act as chemical messengers to regulate specific body functions.
ductless glands that empty their hormonal products directly into the blood.
group of chemical substances including certain hormones and cholesterol.They are fat soluble and contain little oxygen.
third chemical class or steroid hormones which include leukotrienes and prostaglandins.
when a given hormone influences the activity of only certain tissue cells.
in some instances, target cells form more receptors in response to rising blood levels.
involves loss of receptors and prevents target cells from overreacting to persistently high hormone levels.
when endocrine glands secrete hormones in direct response to changing blood levels of certain critical ions and nutrients.
rarely it is when nerve fibers stimulate hormone release
when endocrine glands release their hormones in response to hormones produced by other endocrine organs.
located in the center of the brain, functioning to secrete melatonin and serotonin
region of the diencephalon forming the floor of the third ventricle of the brain.
Neuroendocrine gland located beneath the brain that serves a variety of functions including regulation of gonads,thyroid,adrenal cortex,lactation and water balance.
one of the bodies largest endocrine glands,straddles the anterior trachea.
controls the amount of calcium in the blood within the bones
lymphoid organ and endocrine gland active in immune response,site of maturation and T lymphocytes
located superior to kidneys and each consist of medulla and cortex areas.
located partially behind the stomach in the abdomen, and it functions as both an endocrine and exocrine gland. It produces digestive enzymes as well as insulin and glucagon
one of usually two organs that produce ova and secrete estrogen and progesterone
The male gonads, which produce sperm and secrete male sex hormones.