velocity of movement cross-bridging cross-sectional
The skeletal muscle fiber arrangement that allows for more sarcomeres in series is better designed for _________________?
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velocity of movement |
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cross-bridging |
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cross-sectional area |
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force production |
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 basic force producing unit of muscle. It is formed of many actin and myosin filaments and the repeating units between two Z lines form a sarcomere. Myosin filaments overlap the actin filaments within a sarcomere. The attachment of myosin with the actin in muscle cell is called as cross bridge formation.
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.
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