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Boundless Biology
The Musculoskeletal System
Biology Textbooks Boundless Biology The Musculoskeletal System
Biology Textbooks Boundless Biology
Biology Textbooks
Biology

Section 4

Muscle Contraction and Locomotion

Book Version 32
By Boundless
Boundless Biology
Biology
by Boundless
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7 concepts
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Structure and Function of the Muscular System

The muscular system controls numerous functions, which is possible with the significant differentiation of muscle tissue morphology and ability. 

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Skeletal Muscle Fibers

Skeletal muscles are composed of striated subunits called sarcomeres, which are composed of the myofilaments actin and myosin.

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Sliding Filament Model of Contraction

In the sliding filament model, the thick and thin filaments pass each other, shortening the sarcomere.

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ATP and Muscle Contraction

ATP is critical for muscle contractions because it breaks the myosin-actin cross-bridge, freeing the myosin for the next contraction.

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Regulatory Proteins

Tropomyosin and troponin prevent myosin from binding to actin while the muscle is in a resting state.

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Excitation–Contraction Coupling

Excitation–contraction coupling is the connection between the electrical action potential and the mechanical muscle contraction.

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Control of Muscle Tension

Muscle tension is influenced by the number of cross-bridges that can be formed.

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