Answer
b. sarcomere
Work Step by Step
The sarcomere is the contractile unit; a myofibril is made up of many sarcomeres that lie end to end. Each sarcomere ends at a Z line.
Biology: The Unity and Diversity of Life (14th Edition)
by Starr, Cecie; Taggart, Ralph; Evers, Christine; Starr, Lisa
Published by
Brooks/Cole Publishing Co.
ISBN 10:
1305073959
ISBN 13:
978-1-30507-395-1
Chapter 35 - Self-Quiz - Page 619: 7
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