Definitions

1. Action potential is an all-or-nothing phenomenon and represents the basic electrical signal of the neuron.
2. The action potential is generated by the movement of positively charged atoms in and out of channels in the axon's membrane.
3. The action potential is repeatedly regenerated along the length of the axon. (Web site)
4. The action potential was first described in frogs in 1862, by the Russian physiologist Friedrich Bidder. (Web site)
5. If an action potential is generated at the axon hillock it now will spread quickly along the axon as a "wave" of depolarization. (Web site)

Muscular Contraction

1. Emil Du bois-Reymond German physiologist Emil Du bois-Reymond describes an "action potential" accompanying each muscular contraction.

Depolarizes

1. Consequently, the inward current that depolarizes the axon membrane ahead of the action potential cannot produce another action potential behind it. (Web site)

Presence

1. For strongly adapting interneurons, however, the rate of rise of the action potential also was reduced, suggesting the presence of an additional mechanism.
2. Therefore an increased dispersion of action potential duration at 90% of repolarization during simulated ischemia in presence of azimilide was seen. (Web site)

Region

1. By definition, the receptive field is the region within the entire visual field which elicits an action potential. (Web site)

Vesicles

1. Arrival of the action potential causes some of the vesicles to move to the end of the axon and discharge their contents into the synaptic cleft.

Brain Function

1. Fundamental discoveries, like the action potential or the synaptic vesicle, provided new insight into brain function. (Web site)

Cell

1. In the electrical conduction system of the heart, calcium replaces sodium as the mineral that depolarizes the cell, proliferating the action potential.

Potential

1. If the potential is reduced to the threshold voltage (about -50 mv in mammalian neurons), an action potential is generated in the cell.

Brain Cells

1. Neurons are the cells that generate Action Potential s and convey information to other cells; these constitute the essential class of brain cells.

Threshold

1. When the stimulus reaches threshold, an action potential from one or both giant axons will suddenly appear.

Nerves

1. The form of the action potential provides information about the ability of the muscle to respond when the nerves are stimulated. (Web site)

Conduction

1. When an axon is demyelinated as occurs in MS, the rate of conduction slows down because the action potential can no longer “jump” down the axon.

Target Cell

1. Arriving neurotransmitters then either stimulate or suppress an action potential in the target cell, depending on the neurotransmitter and its receptor. (Web site)

Neuroscientists

1. Neuroscientists use other words, such as a "spike" or an "impulse" for the action potential.
2. For this reason, the squid giant axons were used by neuroscientists to work out the basic properties of the action potential.

Impulse

1. It is the purpose of the ReBuilder� to be an external source of stimulus to induce an action potential impulse which will then proceed fully along the axon. (Web site)
2. Normally, the action potential impulse will spread through the heart quickly enough that each cell will only respond once. (Web site)
3. If so, an action potential occurs and spreads along the membrane of the post-synaptic neuron (in other words, the impulse will be transmitted).

Myelin Sheath

1. The myelin sheath around most vertebrate axons provides a layer of insulation that prevents the loss of the electrical signal from an action potential. (Web site)

Propagation

1. This domain organization is essential for action potential propagation by saltatory conduction and for the overall function and integrity of the axon. (Web site)
2. Invertebrates do not have myelin to speed the velocity of propagation of the action potential.
3. The Hodgkin-Huxley equations model the propagation of an action potential down a nerve fiber, and represent one of the cornerstones of modern neuronscience.

Ion Channels

1. They contain ion channels and are responsible for propagating the action potential down the axon by saltatory conduction.
2. The effect of quinidine on the ion channels is to prolong the cardiac action potential, thereby prolonging the QT interval on the surface ECG. (Web site)

Synapses

1. Neuroscientists know only a few of the basics of neuroscience, such as the nature of the action potential and the chemical nature of most synapses. (Web site)

Membrane Potential

1. The voltage across the capacitor is the membrane potential (see action potential for an example of a membrane RC circuit).
2. Likewise during an action potential, the magnitude of the membrane potential will vary in time and space along a nerve fiber.

Neuron

1. Or a nerve impulse is actually the movement of an action potential along a neuron as a series of voltage-gated ions channels open and close.
2. When an action potential reaches the end of a neuron, the signal is transmitted to another cell, such as a muscle cell or another neuron.
3. If threshold is met or exceeded, the neuron generates an output signal called an action potential.

Axons

1. In axons that lack a fatty, insulating myelin sheath, this propagation of the action potential occurs continuously along the length of the axon. (Web site)
2. Many axons are wrapped in thick sheaths of a fatty substance called myelin, which serves to greatly increase the speed of action potential propagation. (Web site)

Axon

1. When an action potential, traveling along an axon, arrives at a synapse, it causes a chemical called a neurotransmitter to be released. (Web site)
2. Axon - This long, cable-like projection of the cell carries the electrochemical message (nerve impulse or action potential) along the length of the cell.
3. The longer the axon, the more time it will take for the action potential to reach the synapse.

Action Potential

1. An action potential occurs when a neuron sends information down an axon, away from the cell body. (Web site)
2. The action potential travels up an axon (the cell body of the neuron will be in a dorsal root ganglion).
3. Release of neurotransmitters usually follows arrival of an action potential at the synapse, but may also follow graded electrical potentials. (Web site)

Categories

1. Axon
2. Neuron
3. Membrane Potential
4. Cell Body
5. Synapse
6. Books about "Action Potential" in Amazon.com
   

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