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An action potential is triggered when a sufficiently strong neural signal reaches the trigger zone of a neuron, which is the axon hillock or the initial segment of the axon.
The trigger zone contains a dense concentration of voltage-gated sodium-ion pores, which open and allow sodium ions into the neuron when the membrane voltage there rises from about -70mV resting potential to a trigger threshold of about -55mV as a result of a summing of inputs to the neuron.
The resulting inrush of sodium ions through the ion pores is the beginning of the action potential.
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∙ 10y ago
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∙ 12y agoelectrical, mechanical, thermal, and chemical stimuli
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∙ 12y agoElectrical , heat and chemical stimuli
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∙ 13y agoelectrical, heat, and pressure (pinching)
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∙ 13y agothreshold stimulus.
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∙ 13y agoa threshold level stimulus
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∙ 13y agoelectrical, heat, pressure
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When an action potential reaches the end of a neuron it triggers the release of?
When an action potential reaches the end of a neuron, it triggers the release of neuotransmitters such as epinephrine (sympathetic) or achetylcholine (parasympathetic).
What triggers the action potential?
A temporary accumulation of sodium ions at the axon hillock which yields a voltage sufficient to open voltage-gated ion pores on the axon is what triggers an action potential.
What change in membrane potential triggers an action potential?
An ion channel.
When the neuron is sussiciently stimulated this process and triggers the action potential?
depolarization
When the neuron is sufficiently stimulated this process occurs and triggers the action potential?
depolarization
What change in membrane potential triggers action potential?
depolarization
When an action potential reaches the end of a neuron it triggers the release of?
When an action potential reaches the end of a neuron, it triggers the release of neuotransmitters such as epinephrine (sympathetic) or achetylcholine (parasympathetic).
What change in membrane potential depolarization or hyperpolarization triggers an action potential?
despolarization
What triggers the action potential?
A temporary accumulation of sodium ions at the axon hillock which yields a voltage sufficient to open voltage-gated ion pores on the axon is what triggers an action potential.
What change in membrane potential triggers an action potential?
An ion channel.
When the neuron is sussiciently stimulated this process and triggers the action potential?
depolarization
When the neuron is sufficiently stimulated this process occurs and triggers the action potential?
depolarization
Is calcium a neurotransmitter?
No, calcium itself is not a neurotransmitter BUT it is highly important in the process of the action potential. The action potential triggers the influx of calcium at the end of the terminal bouton, causing the influx of Ca2+ into the cell and this triggers for the release of the neurotransmitter. :)
What event most directly triggers the release of calcium from the terminal cisternae?
action potential propagating down the T tubule
Why does a dead frogs leg move when electricity is passed through them?
The electrical current triggers an action potential at the neuromuscular junction, causing the muscle cells to depolarize and contract.
What action does insulin trigger the liver to perform?
it triggers horrnyness
What was the effect of curare on eliciting an action potential?
It creates an action potential
