Search results
Results from the WOW.Com Content Network
Positive feedback is used in digital electronics to force voltages away from intermediate voltages into '0' and '1' states. On the other hand, thermal runaway is a type of positive feedback that can destroy semiconductor junctions. Positive feedback in chemical reactions can increase the rate of reactions, and in some cases can lead to explosions.
Graded potentials that make the membrane potential less negative or more positive, thus making the postsynaptic cell more likely to have an action potential, are called excitatory postsynaptic potentials (EPSPs). [4] Depolarizing local potentials sum together, and if the voltage reaches the threshold potential, an action potential occurs in ...
The first principle is positive feedback. In computer models, a molecule that can be either membrane-associated or cytoplasmic can polarize when its association with the membrane is subject to positive feedback: that membrane localization occurs most strongly where the molecule is already most highly concentrated.
Na + channels both open and close more quickly than K + channels, producing an influx of positive charge (Na +) toward the beginning of the action potential and an efflux (K +) toward the end. Ligand-gated sodium channels, on the other hand, create the change in the membrane potential in the first place, in response to the binding of a ligand ...
Labeled diagram of Golgi tendon organ from the human Achilles ... The switch to autogenic excitation is a form of positive feedback. ... Anatomy and Physiology: ...
The positive feedback of the rising phase slows and comes to a halt as the sodium ion channels become maximally open. At the peak of the action potential, the sodium permeability is maximized and the membrane voltage V m is nearly equal to the sodium equilibrium voltage E Na .
The Hodgkin cycle represents a positive feedback loop in which an initial membrane depolarization leads to uncontrolled deflection of the membrane potential to near V Na. The initial depolarization must reach or surpass a certain threshold in order to activate voltage-gated Na + channels .
However, the positive point, at which the action potential starts, varies between cells. [citation needed] It can also be altered by hormonal stimulation of the neuron, or by second messenger effects of neurotransmitters. [citation needed] The axon hillock also delineates separate membrane domains between the cell body and axon. [4]