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How does a threshold prevent a neuron from generating too many action potential?
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The anatomical region of a multipolar neuron that has the lowest threshold for generating an action potential is?
Axon hillock
The action potential is generated when a stimulus?
When a stimulus stimulates a neuron above the threshold, the action potential is generated.
What is sub threshold Depolarization of nerves?
Subthreshold depolarization refers to a small increase in the membrane potential of a nerve cell that does not reach the threshold for generating an action potential. It is a graded response that occurs when the membrane potential of the nerve cell approaches but does not exceed the threshold for firing an action potential. Subthreshold depolarizations can summate or integrate within the cell to reach the threshold and trigger an action potential.
A neuron fires only when its membrane reaches what?
When it reaches the nerve impulse threshold, the next neuron will fire..
When a neuron reaches its threshold?
When a neuron reaches its threshold, it initiates an action potential. This is a brief electrical impulse that allows for communication between neurons. The action potential travels down the axon of the neuron to transmit signals to other neurons or cells.
How long does an action potential occur for?
2 milliseconds.
Neuron receives a series of stimuli whose effect is excitatory but subthreshold?
If a neuron receives a series of stimuli that have an excitatory effect but do not reach the threshold for action potential initiation, the neuron will not fire. This is because the individual stimuli do not generate a strong enough depolarization to reach the threshold. However, if enough subthreshold stimuli are received in a short period of time, they can summate and reach the threshold, generating an action potential.
Disturbances when will sensory neurons result in an action potential?
if the graded potential of threshold size reaches a trigger zone
When a stimulus is sufficiently great enough to change the membrane potential and propagate an action potential it is called?
recruitement
Why is the amplitude of the compound action potential recorded from the frog sciatic nerve increased when the voltage of the stimulus was increased above the threshold value?
when the voltage of the stimulus is increased above threshold, it can instantly trigger the action potential into a depolarizing state which will rapidly shoot up above the threshold value.
Minimum level of stimulation required to trigger a neural impulse?
An action potential needs to occur to trigger the neurons but the action potential depends on whether a stimulus is able to bring the membrane potential to a certain level termed the THRESHOLD. This threshold is about -55 mV for most neurons, but the stimulus needs to bring the membrane potential to this certain level or it will not be triggered. Relating to the ALL-OR-NONE PRINCIPLE, which if the threshold is not acquired then an action potential will not occur but once a stimulus is strong enough to depolarize (making the inside of the cell less negative going from -70 mV to -55 mV) it will trigger. The resting potential is -70 mV which the stimulus needs to bring it up to -55mV.
How does a nerve impulse follow the all or nothing principle?
The action action potential produced needs to reach the threshold for the AP to be propagated. If it doesn't reach the threshold, there is not enough Na+ to stimulate the positive feedback system which allows the action potential to be self-propagated. Instead, K+ channels will be opened, and it will enter repolarisation phase, and the AP wll not be conducted.
