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Depolarization of the cell membrane. When the sodium channels open there is a rush of sodium ions down their concentration gradient into the cell. As they carry positive charge they reduce the potential difference (inside negative) across the membrane of the neuron.
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoHypopolorization
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A nerve impulse results from?
It results from the opening of voltage-gated sodium ion channels, causing an influx of sodium ions (influx of positively-charged ions), depolarizing the neuronal membrane.
Name the membrane valves that open and close for potassium efflux and sodium influx?
ion channels
The combining of the neurotransmitter with the muscle membrane receptors causes the membrane to become permeable to sodium ions and blank of the membrane?
Depolarization
In the sodium potassium pump sugars and amino acids or other molecules are brought through the membrane along with sodium ions through?
Coupled Channels
The greater influx of sodium ions results in what of the membrane?
depolarization
Opening of sodium channels in the membrane of a neuron results in?
depolarization.
Depolarization of the nerve membrane begins with?
opening of sodium channels
Binding of the Acetylcholine to receptors causes a by opening what channels that permit both potassium and sodium to permeate the membrane?
Nicotinic by depolarization
Effects of lidocaine on nerves?
it prevents sodium channels from opening which removes a neuron's resting membrane potential
How is an action potential propagated down an axon after voltage-gated sodium channels open in a region of the neuron's membrane?
The entry of sodium ions into the neuron and their diffusion to adjacent areas of the membrane causes those portions of the membrane to become depolarized and results in the opening of voltage-gated sodium channels farther down the axon, which release potassium ions to the outside, returning the charge to its previous state
Describe the events occurring in the cell membrane that permit the conduction of an impulse?
When a nerve impulse is conducted, the neuronal cell membrane undergoes changes in electrical potential. This starts with a rapid influx of sodium ions into the cell through voltage-gated sodium channels, depolarizing the membrane. This depolarization triggers the opening of adjacent sodium channels, resulting in an action potential that travels along the membrane. After the impulse passes, the sodium channels close, and potassium channels open, allowing potassium ions to exit the cell and restore the resting potential.
What causes Local depolarization that leads to generate action potential?
Opening of sodium channels and the fact that potassium channels are still closed leads to rapid depolarization that may lead to the neuron firing.
A nerve impulse results from?
It results from the opening of voltage-gated sodium ion channels, causing an influx of sodium ions (influx of positively-charged ions), depolarizing the neuronal membrane.
What happens to the neuron if sodium channels do not open?
causes chemically gated sodium channels to open
What changes occur in the neuron during an action potential?
During an action potential, the neuron undergoes a rapid change in membrane potential as sodium ions rush into the cell, leading to depolarization. Subsequently, potassium ions move out of the cell, repolarizing the membrane back to its resting state. This rapid change in membrane potential allows for the transmission of electrical signals along the neuron.
What happens when you open the sodium channels in the membrane of a neuron?
When this occurs, the membranes potenial drops, as potassium and sodium diffuse with their gradient.
Drugs that decrease membrane permeability to sodium are used as what?
Drugs that decrease membrane permeability to sodium are used as local anesthetics. These drugs block the sodium channels and prevent NA+ from entering the cell. NA+ influx is important to dipolarize the membrane.
