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Action potential - Wikipedia
An action potential occurs when the membrane potential of a specific cell rapidly rises and falls. This depolarization then causes adjacent locations to similarly depolarize. Action potentials occur in several types of excitable cells, which include animal cells like neurons and muscle cells, as well as some plant … See more
Nearly all cell membranes in animals, plants and fungi maintain a voltage difference between the exterior and interior of the cell, called the membrane potential. A typical voltage across an animal cell membrane is −70 … See more
Anatomy of a neuron
Several types of cells support an action potential, such as plant cells, muscle cells, and the specialized cells of the heart (in which occurs the cardiac action potential). However, the main excitable cell is the neuron See moreThe action potential generated at the axon hillock propagates as a wave along the axon. The currents flowing inwards at a point on the axon during an action potential spread out along the axon, and depolarize the adjacent sections of its membrane. If … See more
Cardiac action potentials
The cardiac action potential differs from the neuronal action potential by having an extended plateau, in which the membrane is held at a high … See moreAction potentials result from the presence in a cell's membrane of special types of voltage-gated ion channels. A voltage-gated ion channel is a transmembrane protein that has three key properties:
1. It is capable of assuming more than one conformation. See moreThe course of the action potential can be divided into five parts: the rising phase, the peak phase, the falling phase, the undershoot phase, … See more
Chemical synapses
In general, action potentials that reach the synaptic knobs cause a neurotransmitter to be released into the synaptic cleft. Neurotransmitters are small molecules that may open ion channels in the postsynaptic cell; … See moreWikipedia text under CC-BY-SA license Action potential: Definition, Steps, Phases - Kenhub
Nov 3, 2023 · An action potential is caused by either threshold or suprathreshold stimuli upon a neuron. It consists of three phases: depolarization, overshoot, and repolarization. An action potential propagates along the cell membrane of an …
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Cardiac action potential - Wikipedia
Action potential | Definition, Steps, & Facts | Britannica
Jan 3, 2025 · Learn about the brief reversal of electric polarization of a nerve or muscle cell that produces a nerve impulse or a contraction. Find out how ion channels, membrane potential, and action potential are related and how they …
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Neurons Firing: How Do Action Potentials Work?
Dec 1, 2023 · An action potential allows a nerve cell to transmit an electrical signal down the axon toward other cells. This sends a message to the muscles to provoke a response.
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Sep 23, 2023 · Neurones communicate with each other via electrical signals known as action potentials. They are brief changes in the voltage across the membrane due to the flow of certain ions into and out of the neurone. In this …
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