20. Introduction to the endocrine system
20. Introduction to the endocrine system
- Gillian Pocock, Gillian PocockSenior Lecturer in Clinical Science, Canterbury Christ Church University, Canterbury, UK
- Christopher D. RichardsChristopher D. RichardsEmeritus Professor of Experimental Physiology, Division of Physiology, Pharmacology and Neuroscience, Faculty of Life Sciences, University College London, London, UK
- and David A. RichardsDavid A. RichardsAssociate Professor, Department of Basic Pharmaceutical Sciences, Husson University School of Pharmacy, Bangor, Maine, USA
Abstract
This chapter talks about complex multicellular organisms which require coordinating systems that can regulate and integrate the functions of different cell types. Two coordinating systems have evolved: the nervous system and the endocrine system. It details how the endocrine system uses chemical signalling to regulate the activity of particular cell populations. The chapter looks at chemical agents known as hormones, which are produced by cells within endocrine tissues and travel in the bloodstream to other cells upon which they exert a regulatory effect. Therefore, a hormone is usually defined as a blood-borne chemical messenger, and endocrinology is defined as the study of the endocrine glands, their hormones, and their target tissues.
