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Why does not the peak value of the action potential increase with stronger stimuli?
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Does strong stimuli cause the strength of action potentials to increase?
No, it doesn't become "larger" - the peak potential is always the same - it is a digital signal. Stronger stimulus will cause the nerve cell to fire more often - therefore stimulus strength is translated as action potential frequency.
A series of similar stimuli that increases change in local membrane potential is called?
Action potential
Strong stimuli cause the amplitude of action potentials generated to increase?
Yes. ....Up to a point. There is a threshold the stimulus must surpass before creating a CAP (compound action potential). Anything below this threshold is called subthreshold. Once the stimulus is strong enough cause a CAP it is a stimulus threshold. At this point the CAP will continue to increase as the intensity of the stimulus increases (now termed suprathreshold) until a maximal stimulus causes a maximum response. Any stimulus stronger than the maximal stimulus is called a supramaximal and does not result in any larger a CAP than the maximum response caused by the maximal stimulus. source: http://www.unmc.edu/physiology/Mann/mann12.html
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.
If the axolemma becomes more permeable to potassium ion?
a stronger stimulus will be required to cause an action potential
Does strong stimuli cause the strength of action potentials to increase?
No, it doesn't become "larger" - the peak potential is always the same - it is a digital signal. Stronger stimulus will cause the nerve cell to fire more often - therefore stimulus strength is translated as action potential frequency.
What kinds of stimuli can elicit action potential?
Electrical , heat and chemical stimuli
A series of similar stimuli that increases change in local membrane potential is called?
Action potential
Strong stimuli cause the amplitude of action potentials generated to increase?
Yes. ....Up to a point. There is a threshold the stimulus must surpass before creating a CAP (compound action potential). Anything below this threshold is called subthreshold. Once the stimulus is strong enough cause a CAP it is a stimulus threshold. At this point the CAP will continue to increase as the intensity of the stimulus increases (now termed suprathreshold) until a maximal stimulus causes a maximum response. Any stimulus stronger than the maximal stimulus is called a supramaximal and does not result in any larger a CAP than the maximum response caused by the maximal stimulus. source: http://www.unmc.edu/physiology/Mann/mann12.html
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.
What is the difference between a compound action potential and a single action potential?
Single action potentials follow the "all or none" rule. That is, if a stimulus is strong enough to depolarize the membrane of the neuron to threshold (~55mV), then an action potential will be fired. Each stimulus that reaches threshold will produce an action potential that is equal in magnitude to every other action potential for the neuron. Compound action potentials do not exhibit this property since they are a bundle of neurons and have different magnitudes of AP's. Thus compound action potentials are graded. That is, the greater the stimulus, the greater the action potential.
What will increase the rate of conduction of an action potential along a nerve?
Myelinating the nerve
When the interval between the stimuli decreases a second action potential is generated how?
When a stimuli decreases, it is seen as less extreme. When this happens it is called affective habituation and many different studies and tests have been completed to prove this theory.
If the axolemma becomes more permeable to potassium ion?
a stronger stimulus will be required to cause an action potential
How did increasing the stimulus voltage in the simulation affect the action potential?
Increasing the stimulus voltage in the simulation affect action potential mainly because increasing the current will automatically increase the voltage.
When can a second nerve impulse cannot be generated?
The generation of a second action in some neurons can only happen after a refractory period, when the membrane potential has returned it's base level or even more negative. This is because some types of Na+ channels inactivate at a positive potential and then require a negative potential to reset. Other neurons have other types of channels and can fire multiple action potentials to a single depolarization.
Why does the nerve action potential increase slightly when you add 1.0 V to the threshold voltage and stimulate nerve?
The action potential increases slightly because more neurons are being stimulated.
