Endocrine system consists of: glands that secrete hormones into the bloodstream
Hormone is a chemical messenger released by an endocrine gland to regulate metabolism, growth, development, tissue function, sexual function, sleep, mood, and other processes.
The hypothalamus secretes releasing or inhibiting factors which stimulates/inhibits anterior pituitary gland
The hypothalamus secretes releasing factors (RF) or inhibiting factors (IF). These are transported via the hypophyseal portal vein to the anterior pituitary where they stimulate or inhibit secretion of specific hormones from the anterior pituitary.
Anterior Pituitary - produces several hormones including ACTH, TSH, FSH, LH, GH, prolactin, and MSH
Posterior Pituitary Gland stores and releases oxytocin and antidiuretic hormone from the hypothalamus
Thyroid Gland produces thyroxine (T4) and triiodothyronine (T3)