The action potential is followed by an inexcitable period called the refractory period, which usually lasts one or two milliseconds. The whole process takes less than one millisecond and its amplitude is always the same (all or none law) for a given axon, whatever the magnitude of the stimulus. The voltage changes from about −70 mV to +40 mV and then falls rapidly back to the resting membrane potential as the sodium pump regains its effect. The sodium pump (or sodium/potassium pump) which transports most sodium ions outside the cell and potassium ions inside the cell ceases to function and the sodium ions rush in making the interior of the axon a positive voltage with respect to the outside. The stimulus must be above a certain threshold value to have an effect. It is typically measured in volts.Īction potential The electric current generated in an axon of a nerve cell in response to a stimulus. Send us feedback.The amount of energy required to transfer a unit of positive charge from one point in an electrical field to another (potential difference). These example sentences are selected automatically from various online news sources to reflect current usage of the word 'momentum.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Matthew Vantryon, The Indianapolis Star, 2 Jan. 2022 The Colts needed a big play to continue their momentum against the Raiders on Sunday.
2022 On Tennessee’s second possesion, running back Hilliard ran 5 yards and his upfield momentum was negated on a hit by safety Javon Holland just short of the first down.ĭave Hyde,, 2 Jan. 2022 The Louisville men's basketball team (8-4) is coming off an impressive win against Wake Forest after a lengthy COVID-19 pause, and the Cards look to continue their momentum against Georgia Tech on Sunday. 2022 Her momentum was evident to her teammates, redshirt sophomore guard Kylie Kornegay-Lucas said.Įdward Lee,, 7 Jan.
2022 The Filipino group’s single has held its momentum since the premiere of the official video in October, followed by the group’s performance of the song at the 34th Awit Awards in November. 2022 And if getting in the gym (or maintaining your already existing momentum) is anywhere on your list of resolutions, here’s your sign to refresh your workout wardrobe. 2022 With new kicks and new confidence, the Trojans hope to carry their momentum into a home series against Washington State on Friday at 7 p.m.
Jr Radcliffe, Milwaukee Journal Sentinel, 17 Jan. Recent Examples on the Web Not only that, but the game featured an unusual play where Reggie White picked up a fumble and lateraled it to LeRoy Butler, who ran the rest of the way for a touchdown and let his momentum carry him into the stands.
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