Chapter 17.3, Problem 6LO

Summary Introduction

To name: The three structural categories of circulating hormones and give examples within each category.

Concept introduction: The endocrine system is the chemical signaling system that uses blood vessels as information channels. This system interacts with other body cells through hormone production. There are three general categories of circulating hormones, namely steroid, biogenic amines, and proteins. All of them differ in their solubility influences which can influence the transport of hormones in the blood and their interactions with their target cells.