Hadley provides an comprehensive coverage of endocrinology, centralizing on the critical roles of chemical messengers and hormones--whether they are of endocrine or neural origin--in the control of physiological processes. This up-t o-date Fourth Edition depicts, through demonstration, the entire human endocrine system in examples designed specifically for premedical and related professional courses. Hadley examines several recently discovered hormones--including their origin , biosynthesis, chemistry, secretion, circulation and metabolism, physiological roles, control of secretion, mechanisms of action and pathophysiology.