Why are only the skeletal muscles tetanized?
• The skeletal muscles are held immobile because they are composed of striated or “stringy” muscle tissue. Striated muscle tissue is easily stimulated by electrical currents. On the other hand, heart muscle is affected only by significantly more powerful currents. Thus, this difference in sensitivity is a natural safety factor. • How do you get the electrical current to the target? • The electrical current is conducted through two channels of ionized air between the device and the target. The channels are created by two laser beams having a wavelength in the far-ultraviolet region, such as of 193 or 248 nanometers. • Why use two beams? • We use two beams because there would otherwise be no return path for the electrical current. One beam creates a conductive channel of ionized air to the target and the second beam ionizes another channel through which the current returns. In this way, the target becomes a part of the electrical circuit. • Are the beams visible? • Although the ultraviol
