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The action potential is generated when a stimulus?
The action potential is generated when a stimulus causes a change in the electrical potential across the cell membrane, resulting in the opening of voltage-gated ion channels. This allows an influx of sodium ions, causing depolarization of the membrane and initiation of the action potential.
Where in a neuron can an action potential be generated?
An action potential is generated at the axon hillock of a neuron, which is the region where the cell body (soma) transitions into the axon. This is where the concentration of voltage-gated sodium channels is highest, allowing for the initiation of the action potential.
Can subthreshold stimulation cause an action potential?
No, subthreshold stimulation is not sufficient to trigger an action potential. The membrane potential needs to reach a certain threshold level for an action potential to be generated. Subthreshold stimulation only produces graded potentials that do not reach the threshold for firing an action potential.
What is missing in the receptive region which prevents an action potential from being generated there?
voltage gated ion channel
What has to be crossed before the neuron fires?
The threshold potential must be reached for the neuron to fire. This is the level of depolarization that triggers an action potential to be generated and propagated along the neuron.
The action potential is generated when a stimulus?
The action potential is generated when a stimulus causes a change in the electrical potential across the cell membrane, resulting in the opening of voltage-gated ion channels. This allows an influx of sodium ions, causing depolarization of the membrane and initiation of the action potential.
Where in a neuron can an action potential be generated?
An action potential is generated at the axon hillock of a neuron, which is the region where the cell body (soma) transitions into the axon. This is where the concentration of voltage-gated sodium channels is highest, allowing for the initiation of the action potential.
What ion is released when action potential is generated on the sarcolemma?
Potassium.
What happens to the heart when an action potential is generated in the SA node?
it contracts
What happens in the heart when an action potential is generated in the SA node?
Myocardial contraction
Can subthreshold stimulation cause an action potential?
No, subthreshold stimulation is not sufficient to trigger an action potential. The membrane potential needs to reach a certain threshold level for an action potential to be generated. Subthreshold stimulation only produces graded potentials that do not reach the threshold for firing an action potential.
Where does an action potential start?
Action potentials are generated on a part of the neuron called the 'axon hillock' - the proximal most portion of the axon.
Why does the action potential travel in one direction?
The action potential travels in one direction because of the refractory period, which prevents the neuron from firing again immediately after an action potential has been generated. This ensures that the signal moves in a linear fashion along the neuron.
What is missing in the receptive region which prevents an action potential from being generated there?
voltage gated ion channel
What has to be crossed before the neuron fires?
The threshold potential must be reached for the neuron to fire. This is the level of depolarization that triggers an action potential to be generated and propagated along the neuron.
Why does an action potential propagate unidirectionally along an axon?
An action potential propagates unidirectionally along an axon because of the refractory period, which prevents the neuron from firing in the opposite direction immediately after an action potential is generated. This ensures that the signal travels in one direction, from the cell body to the axon terminal.
Which action will cool the pizza most quickly?
separate the pieces and put them on an unheated metal tray
