PNNL

Abstract

In a broad sense, communication between cells and tissues can occur via the central nervous system (CNS) as well as through release of chemical messengers (hormones) or signals from the endocrine system. Chemical signaling can be further divided into autocrine and paracrine actions to distinguish between effects on similar or different cell types. Although the focus in this chapter is the HPT axis of teleosts, the function of the endocrine system in general is much broader and contributes to the regulation of many physiological processes, such as digestion, metabolism, growth, and development. In essence, the endocrine system is involved with all phases of maintenance of homeostasis, and its function is intimately integrated with that of the CNS. Therefore, we initially describe the interaction between the CNS and thyroid system, and briefly discuss the reproductive system, as well, before describing control processes involved in regulation of these systems.