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: 1a

Answer

The endocrine system is made up of glands and hormones.

Work Step by Step

Glands secrete hormones into the bloodstream to affect the functions of cells in other parts of the body. Hormones are chemicals that bind to target cells and affect certain activities within them.
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