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What behavior is observed if the voltage across a neuronal membrane is set to -20 mV?
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The term voltage regulated means that the?
membrane voltage gated ion channels open and close with changes in the membrane potential
What voltage gated channels are present?
in the membrane that covers axons
How does the plasma membrane at the trigger zone differ from that on the soma?
The plasma membrane has voltage gated channels whereas the soma does not.
Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials?
Sodium channels. A neuron's membrane potential may depolarize for many reasons (neurotransmitters, mechanical deflection, electrical synapse, etc). When that membrane depolarizes to the point of its threshold of activation, then voltage gated channels open up an allow an influx of sodium into the cell. This rapidly depolarizes the cell's membrane, causing that upward peak or rising phase to occur.
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.
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.
The term voltage regulated means that the?
membrane voltage gated ion channels open and close with changes in the membrane potential
What is a membrane potential?
a voltage or electrical charge across the plasma membrane
Which type of membrane channels are found at the axon?
Voltage-gated Na+ and voltage-gated K+ channels
What is the voltage different on either side of the plasma membrane?
Mp
What voltage gated channels are present?
in the membrane that covers axons
How does the plasma membrane at the trigger zone differ from that on the soma?
The plasma membrane has voltage gated channels whereas the soma does not.
What factors contribute to the membrane potential of a cell?
There are many factors that contribute to the membrane potential of a cell. The driving force of ions which are a summation of voltage gradient and concentration gradient are an important one. Also other proteins and amino acids contribute to the cell's membrane potential.
What is the ability of nerve and muscle cells to produce changes in membrane voltage?
excitablity
What is the mechanism that restores the resting membrane voltage and intracellular ionic concentration?
repolarization
Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials?
Sodium channels. A neuron's membrane potential may depolarize for many reasons (neurotransmitters, mechanical deflection, electrical synapse, etc). When that membrane depolarizes to the point of its threshold of activation, then voltage gated channels open up an allow an influx of sodium into the cell. This rapidly depolarizes the cell's membrane, causing that upward peak or rising phase to occur.
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.
