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Is the intensity of the stimulus is indicated by what action potential?
Wiki User
∙ 13y ago
It is not universal, but the general rule is that stimulus intensity in the nervous system is frequency encoded, e.g. more rapid firing with temperature or with pressure. Some action potentials, as in the heart (excitable but not nervous tissue) have a broadening of the plateau due to calcium entry. In this case the change in the shape of the spike is as important as the change in frequency. Usually this question is directed at the retinal cells which have a generator potential which is graded to light intensity.
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoEither by more or less neurotransmitter release, or by frequency (multi action potentials perceived as a stronger stimulus).
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Receptors provide information about the intensity of a stimulus through?
the frequency of their action potentials
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.
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.
During which period can a second action potential be initiated by a larger than normal stimulus?
This the relative refractory period.
How does graded potential occur?
Graded potential occurs when triggered by a stimulus and gated ion channels open these gated channels can either be chemically gated or mechanically gated. In order to have graded potential threshold must be met in order to generate action potential. Good day!
The action potential is generated when a stimulus?
When a stimulus stimulates a neuron above the threshold, the action potential is generated.
What is the response if you increase the stimulus intensity past the threshold level for a neuron?
Try increases dramatically......
What is the Difference between a weak stimulus and intense stimulus?
The FREQUENCY of action potentials that are conducted into the central nervous system serves as the code for the strength of the stimulus. This frequency code is needed because the amplitude of action potentials is constatnt (all or none). Acting through changes in action potential frequency, tonic receptors thus provide information about the relative intensity of a stimulus.
What potential does amplitude independent of stimulus strength describes?
action potential
Receptors provide information about the intensity of a stimulus through?
the frequency of their action potentials
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.
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 process describes the conversion of an external stimulus to an internal action potential?
transduction
When a stimulus is sufficiently great enough to change the membrane potential and propagate an action potential it is called?
recruitement
What does not belong excitability response to stimulus contractility action potential?
Excitability! cha cha!
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.
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
