The main purpose of this course Provide students with a broad informative background of Hormonal regulation of physiological systems in several vertebrate system. How the endocrine system is functioning, structures. Molecular modes of action of a large variety of vertebrate and invertebrate hormones and understand How metazoan hormones and their functional mechanisms have evolved. The experimental methods used in endocrine research. The evolution and diversity of endocrine control of physiological systems using a comparative approach.