Chapter 17.3, Problem 9LO

Summary Introduction

To compare: Autocrine and paracrine signaling that occur through local hormones.

Concept introduction: Local hormones are biologically active polypeptides that do not circulate within the blood. They are a large group of short-lived signaling molecules and are released by the cells. These hormones bind to either same cells or neighboring cells. They are activated and inactivated quickly.