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 - Assessment - 32.2 The Muscular System - Understand Key Concepts - Page 942: 13

Answer

b.

Work Step by Step

Myofibrils contain thick protein filaments called myosin and thin protein filaments called actin. Contraction of muscles involves the formation of cross-bridges between the actin and myosin filaments. The shape changes in the cross-bridges and pulls the actin fibers toward the middle of the sarcomere, thus shortening the fibers.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.

GradeSaver will pay $15 for your literature essays
GradeSaver will pay $25 for your college application essays
GradeSaver will pay $50 for your graduate school essays – Law, Business, or Medical
GradeSaver will pay $10 for your Community Note contributions
GradeSaver will pay $500 for your Textbook Answer contributions