Biology 2010 Student Edition

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

Chapter 32, Skeletal, Muscular, and Integumentary Systems - Standardized Test Prep - Page 945: 4

Answer

B

Work Step by Step

Options A and D are incorrect. Actin and myosin are muscle filaments that cause contraction of the muscle. Option C is incorrect. Acetylcholine is a neurotransmitter that is secreted from motor neurons. Option B is correct. ATP, or adenosine triphosphate, is the source of energy for muscle contraction.
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