_________________________ is the main functioning unit of muscle fibers and where the “action” takes place. It is bordered at each end by _____________. A. sarcomere; Z lines B. actin; H bands
_________________________ is the main functioning unit of muscle fibers and where the “action” takes place. It is bordered at each end by _____________. A. sarcomere; Z lines B. actin; H bands
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question
12.
The _________________________ is the main functioning unit of muscle fibers and where the “action” takes place. It is bordered at each end by _____________.
A. sarcomere; Z lines
B. actin; H bands
C. myofilament; M lines
D. tropomyosin; I bands
Expert Solution
Step 1
Each of the muscle fibers are made up of even smaller fibers called as myofibrils. These myofibrils are formed of actin and myosin filaments. The actin filaments are thinner and myosin are thicker. The actin filaments are anchored to the Z lines.
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