BIOL 2021 Lecture Notes - Lecture 7: Skeletal Muscle, Central Tendon Of Diaphragm, Anatomical Terms Of Muscle

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Most skeletal muscles run from one bone to another. When one bone moves, the other remains fixed: origin less moveable attachment, insertion more moveable attachment. Skeletal muscles consist of fascicles bundles of muscle fibers running parallel to one another. Fascicle arrangement tells about the action of a muscle and determines the range of motion and power of a muscle. Skeletal muscle fibers shorten to about 70% of their resting length: muscles with long fibers that are parallel to the long axis of the muscle can shorten a great deal but most lack the power. Power is determined by the number of muscle fibers in the muscle: muscles with many short fibers are the most powerful but shorten very little. Fascicle arrangement: parallel fascicles run parallel to the long axis of the muscle. Fusiform spindle-shaped muscles with expanded central belly. Unipennate fascicles insert into one side of tendon. Bipennate fascicles insert into tendon from opposite sides.

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