Chapter 49, Problem 2TYU

Summary Introduction

Introduction: The endocrine system is the chemical signaling system that uses blood vessels as information channels. The endocrine glands are ductless organs located within the organ systems and contain groups of endocrine cells that secrete their hormones directly into their surroundings. Steroid hormones are lipid-soluble hormones. They easily pass through the plasma membrane and bind with receptors inside the target cell.