Depolarization
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Depolarization
In biology, depolarization refers to the event a cell undergoes when its membrane potential grows more positive with respect to the extracellular solution.
depolarization
An electrical state in an excitable cell whereby the inside of the cell is made less negative relative to the outside than at the resting membrane potential.
Depolarization
Certain external stimuli reduce the charge across the plasma membrane.
depolarization The loss of an electrical charge on the surface of a membrane.
depolarized The reduction in the difference in charge (potential) between the outside and inside of a membrane.
depolarization - a shift in the membrane potential to a less negative value; triggered by an action potential
epithelial tissues (epithelium) - cells tightly bound together into sheets ...
The depolarization travels in one direction down the axon of the neuron to the opposite end of the cell. At the "far" end, the neuron has small vesicles containing a neurotransmitter which is released when the membrane depolarization occurs there.
This change in the membrane potential, called depolarization, will cause the voltage-gated sodium channels to open. Sodium ions will rush in, resulting in a rapid change in the charge.
An increase in the threshold for an action potential that occurs in some neurons during a slowly developing or prolonged depolarization.
The beat is actually much more complex and involves other ions. But the end result of this depolarization-repolarization is that the contractile filaments in the cell engage, and the cell contracts.
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 See also: Membrane, Neuron, Cell, Trans, Action
  
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