The muscles are the active part of the locomotor system and the human body has about seven hundred. When they contract under the impulse of the nerves, pulled in the direction of the bones, which are firmly attached by tendons. These are real fibrous structure through which the muscle attaches to bone, slipping by a sheath that prevent friction between the fiber bundles and bone.
Tendons are composed almost exclusively of collagen fibers within the periosteum and bone and muscle that connect through like tiny beads.
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