Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 34, Endocrine and Reproductive Systems - 34.1 - The Endocrine System - 34.1 Assessment - Page 981: 2b


A nonsteroid acts by first binding onto a receptor on the cell membrane. This activates enzymes on the inside surface of the cell, which then causes a secondary messenger such as cAMP or calcium ions to be released inside the cell. This secondary messenger then affects activities within the cell.

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