Intro to Cognitive Science
Threshold potential refers to the critical level of membrane depolarization that must be reached for an action potential to be initiated in a neuron. When the membrane potential reaches this specific value, usually around -55 mV, voltage-gated sodium channels open, allowing sodium ions to flow into the neuron, leading to a rapid change in electrical charge and the propagation of an electrical signal along the nerve cell. This concept is essential in understanding how neurons communicate and how signals are transmitted within the nervous system.
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