41. Each alpha motor neuron and the extrafusal muscle fibers innervated by it make up a motor unit . 42. The sum of all this electrical activity is known as a motor unit action potential ( MUAP ). 43. Motor unit plasticity has implications for improved athletic performance and resistance to immobility as a result of age.44. These work motor units remain active. 45. Old adults show evidence that remaining motor units may become larger as motor units innervate collateral muscle fibers. 46. It also expects new sales opportunities for its diesel motor unit from public transportation, marine industry and Asia. 47. Regulators are still reviewing Raytheon's proposed purchase of the military business of Hughes Electronics, a General Motors unit . 48. Old adults show evidence that remaining motor units may become larger as motor units innervate collateral muscle fibers. 49. To test motor unit stimulation, electrodes are placed extracellularly on the skin and an intramuscular stimulation is applied. 50. The first trial run of a motor unit took place from Oslo to Sarpsborg on 8 March 1945.