Structure of the Muscular System
{"Image DocumentName": "Structure of the Muscular System", "Image ImageDescription": "Nerve Impulses and Muscle Fibers. A muscle is made up of hundreds of long cells called fibers. Muscles work by means of two complementary, or opposing, actions\u2014contraction and extension. Muscle contraction is triggered by nerve impulses. Some nerves provide impulses for many muscle fibers. In other areas, a single nerve may provide impulses to only two or three muscle fibers.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}