Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 13 - Section 13.2 - Skeletal Muscle Fiber Contraction - Check Your Progress - Page 270: 1

Answer

Myofibrils are groups of myofilaments that contract. Myofilaments can be either thin (actin) or thick (myosin) filaments that control muscle striations and contractions. Muscle fibers contain collections of myofibrils that are divided into sarcomeres, which are contractile.

Work Step by Step

Myofibrils are groups of myofilaments that contract. Myofilaments can be either thin (actin) or thick (myosin) filaments that control muscle striations and contractions. Muscle fibers contain collections of myofibrils that are divided into sarcomeres, which are contractile.
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