the reduction of a membrane potential to a less negative value. It is caused by the influx of cations, such as sodium and calcium, through ion channels in the membrane. In many neurons and muscle cells, depolarization may lead to an electric impulse called an action potential.
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Though most people think cruise control is more of a convenience option than a safety feature, next generation adaptive cruise control systems are combining both. Conventional cruise control systems simply maintain a preset speed. The driver presses a button to set the speed, and a servo or actuator on the throttle linkage maintains that speed until the driver steps on the brake, changes the speed setting up or down, or disengages the cruise control.