What arethe Steps OF SkeletalMoscle ContraetHon?

Answered: What are the S ContraeHon

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

What are
the Steps OF Skeletal
Moscle ContraetHon?

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. The sarcomere is the region between two Z lines. Myosin filaments overlap the actin filaments within a sarcomere. According to the sliding filament theory, there is sliding of the actin by the myosin filament. This results in the shortening of the sarcomere but the length of both the actin and myosin filaments remain the same. This theory explains the mechanism of muscle contraction. This is a widely accepted theory of muscle contraction.