MUSCLES

MUSCLES - movement. Skeletal Muscle Structure Muscle fibers...

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Muscles Skeletal Muscle Systems Vertebrates move by the actions of muscles on bones. Tendons attach many skeletal muscles across joints, allowing muscle contraction to move the bones across the joint. Muscles generally work in pairs to produce movement: when one muscle flexes (or contracts) the other relaxes, a process known as antagonism. Muscles have both electrical and chemical activity. There is an electrical gradient across the muscle cell membrane: the outside is more positive than the inside. Stimulus causes an instantaneous reversal of this polarity, causing the muscle to contract (the mechanical characteristic) producing a twitch or
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Unformatted text preview: movement. Skeletal Muscle Structure Muscle fibers are multinucleated, with the nuclei located just under the plasma membrane. The thick filaments are made of myosin and occupy the center of each sarcomere. Thin filaments are made of actin and anchor to the Z line. The head of the myosin molecule is marked by a large cleft extending from the actin binding site on one side to the ATP-binding site/pocket on the other. A cleft of this nature leads to a possibility of coupling between the two sites through conformational changes. This allows for the movement of the head about the neck region and the sequential binding of actin and ATP. 1 2...
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MUSCLES - movement. Skeletal Muscle Structure Muscle fibers...

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