Chapter 49, Problem 14TYU

Summary Introduction

To propose: A hypothesis to explain how a receptor for aldosterone appears to have evolved much earlier than aldosterone itself.

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.

Hypothesis: The receptor for aldosterone might bind with another similar hormone in early times that no longer exist.