Match the terms to their definition. 1. constant speed a nerve going from the brain or central nervous system (CNS) to a motor unit in a skeletal muscle 2. dynamic (isotonic) muscle contraction a group of muscle fibers that are fired by a single motor-neuron signal 3. eccentric muscle contraction the muscle contracts when pressed against an object that does not move 4. fast-twitch fibers the resistance, or overload, to the muscle remains constant through the full range of motion; the muscles, then, must maintain a constant level of exertion throughout the exercise; there are two forms of isokinetic exercise, variable resistance and constant speed 5. hyperplasia a band of tissues that connects a bone to a bone; ligaments function to hold bones together at the joint 6. hypertrophy working the muscles through a range of movement using resistance such as weights and exercise machines 7. isokinetic exercise muscle activation during which an outside force elongates (lengthens) the muscle 8. isometric exercise the muscle is activated (contracted) causing the muscle to shorten; in some cases outside forces acting on the joint cause the muscle to elongate, or lengthen, instead of shortening 9. isotonic exercise an increase in the number of muscle cells 10. ligaments when a muscle becomes larger and stronger in response to overloading 11. motor neuron muscle fibers (white fibers) that generate speed and power 12. motor unit the speed of the movement stays the same throughout the exercise