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What type of channel is responsible for the action potential?
sodium potassium and calcium
After depolarization phase of an action potential the resting potential is restored by?
the action of the sodium-potassium pump, which actively transports sodium ions out of the cell and potassium ions into the cell. This process helps to re-establish the concentration gradients of sodium and potassium ions, returning the cell membrane to its resting potential.
What ions enter the muscle cell during action potential generation?
sodium and potassium
Which electrolyte flows into the cell to initiate depolarization?
Sodium (Na+) is the electrolyte that flows into the cell to initiate depolarization during an action potential. This influx of sodium ions changes the membrane potential, leading to the generation of an action potential.
What is the process called when sodium NA is pumped out of a nerve cell?
during action potentials, sodium and potassium cross the membrane of the synapse after the threshold of membrane potential is reached. There, sodium leaves the synapse and the membrane potential is now positive. this is known as depolarization. then during repolarization, the sodium channels close and the potassium channels open to stabilize the membrane potential. during this time, a second action potential cannot occur and this is an evolutionary advantage because it allows rest in the nerve cells and it allows the membrane potential to equalize.
What two molecules are necessary for the action potential?
Sodium and potassium ions are the two molecules necessary for the action potential in neurons. Sodium ions flow into the cell during depolarization, while potassium ions flow out of the cell during repolarization. This ion movement across the cell membrane is essential for the generation and propagation of the action potential.
Why are sodium ions concentrated on the outside of the neuron?
Sodium ions are concentrated on the outside of the neuron due to the action of the sodium-potassium pump, which actively transports sodium out of the cell in exchange for potassium. This helps maintain the neuron's resting membrane potential and creates a concentration gradient favoring the movement of sodium into the cell during an action potential.
What is the sequence of events of a threshold potential?
Death.
What ionic elements trade places to allow action potential to continue through the neuron?
Sodium and potassium
Why does the membrane have to pump sodium and potassium across the membrane and keeps pumping it?
The membranes of nerve Cells use the Sodium/Potassium pump system to charge It's membranes, for a reversal of this condition constitutes the discharge of this Action Potential - 'keeps pumping it' refers to recharging the membrane's Action Potential.
What is the effect of lidocaine on eliciting an action potential?
Lidocaine inhibits the generation and propagation of action potentials by blocking voltage-gated sodium channels. It prevents the influx of sodium ions necessary for depolarization, thereby preventing the nerve from reaching its threshold potential and firing an action potential.
What type of channel is responsible for action potential?
Voltage-gated sodium channels are primarily responsible for initiating and propagating action potentials in neurons. These channels open in response to depolarization of the cell membrane, allowing sodium ions to enter the cell and initiate the rapid depolarization phase of the action potential.
