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Depolarization is essential to the function of many cells, communication between cells, and the overall physiology of an organism. Action potential in a neuron, showing depolarization, in which the cell's internal charge becomes less negative (more positive), and repolarization, where the internal charge returns to a more negative value.
A depolarizer or depolariser is an optical device used to scramble the polarization of light.An ideal depolarizer would output randomly polarized light whatever its input, but all practical depolarizers produce pseudo-random output polarization.
A typical action potential begins at the axon hillock [41] with a sufficiently strong depolarization, e.g., a stimulus that increases V m. This depolarization is often caused by the injection of extra sodium cations into the cell; these cations can come from a wide variety of sources, such as chemical synapses, sensory neurons or pacemaker ...
Depolarization can conduct a current in the range of 5 fA per channel and occurs on the timescale of action potentials and neurotransmitter exocytosis. [ 10 ] [ 4 ] They have an advantage over other types of ion channel regulation in that they provide non-invasive, reversible membrane potential changes with fine temporal and spatial control ...
These neurotransmitters bind to receptors located on the postsynaptic membrane of the lower neuron, and, in the case of an excitatory synapse, may lead to a depolarization of the postsynaptic cell. An excitatory synapse is a synapse in which an action potential in a presynaptic neuron increases the probability of an action potential occurring ...
Neural accommodation or neuronal accommodation occurs when a neuron or muscle cell is depolarised by slowly rising current (ramp depolarisation) in vitro. [1] [2] The Hodgkin–Huxley model also shows accommodation. [3]
This reflects a common misunderstanding: that depolarization is at odds with activism. But one can do both — and I’d argue aiming to do both actually makes one’s activism more persuasive and ...
The gates also have unique properties with important physiological implications. For example, Na + channels open and close rapidly, while K + gates open and close much more slowly. The difference in speed between these channels underlies the depolarization and repolarization phases of the action potential. [10]