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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.
Can action potentials be summated?
Yes, action potentials can be summated when multiple sub-threshold stimuli are received in rapid succession, causing the neuron to reach threshold and fire an action potential. This process of summation can lead to greater depolarization and stronger signals being sent along the neuron.
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
A series of similar stimuli that increases change in local membrane potential is called?
Action potential
What determines whether a neuron has an action potential?
A neuron will have an action potential if the stimuli it receives are strong enough to reach its threshold level. Once the threshold is reached, voltage-gated channels open, allowing an influx of sodium ions which triggers depolarization and leads to the generation of 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
Can action potentials be summated?
Yes, action potentials can be summated when multiple sub-threshold stimuli are received in rapid succession, causing the neuron to reach threshold and fire an action potential. This process of summation can lead to greater depolarization and stronger signals being sent along the neuron.
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
Does a large stimulus produce a higher amplitude in a action poteintial?
No, the amplitude of an action potential is constant and does not vary with the strength of the stimulus. Instead, the frequency of action potentials fired by a neuron can increase with a stronger stimulus.
A series of similar stimuli that increases change in local membrane potential is called?
Action potential
How did the threshold for second action potential change as you further decrease the interval between the stimuli?
One might find how the threshold will change by inquiring the mind of a scientist at ones local college. Another way to find the answer to this question would be to research it in books at ones local library.
What is relative refactory period?
The relative refractory period is the phase of the cardiac action potential during which a stronger-than-usual stimulus is required to elicit another action potential. It occurs immediately following the absolute refractory period and allows for the heart muscle to be able to respond to a second, stronger stimulus after the initial action potential.
What determines whether a neuron has an action potential?
A neuron will have an action potential if the stimuli it receives are strong enough to reach its threshold level. Once the threshold is reached, voltage-gated channels open, allowing an influx of sodium ions which triggers depolarization and leads to the generation of an action potential.
Which term does not belong excitability response to a stimulus contractility action potential?
The term that does not belong is "action potential." While excitability, response to a stimulus, and contractility are all related to muscle function and the ability of muscle fibers to react to stimuli, an action potential refers specifically to the electrical impulse that triggers these processes.
When the interval between the stimuli decreases a second action potential is generated how?
When the interval between stimuli decreases, the membrane potential of the neuron has not fully returned to its resting state before the next stimulus arrives. This allows the neuron to quickly reach the threshold for generating a second action potential without returning to baseline. This phenomenon is known as temporal summation, where the combined effect of multiple stimuli within a short time frame can lead to the generation of subsequent action potentials.
Neuron receives a series of stimuli whose effect is excitatory but subthreshold?
Then it does nothing unless the stimuli arrive at the same time to be above the threshold. Or the stimuli may undergo temporal summation (with buildup of neurotransmitters in the synapse), where their effects add up over time to be above the threshold.
