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In absolute refractory period, none of channels are reconfigured, so that second active potential cannot be generated no matter how large the stimulus current is applied to the neuron.
In contrast, in relative refractory period, some but not all of channels are reconfigured, another action potential can be generated but only by a greater stimulus current thatn that originally needed.
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What causes absolute refractory period?
The absolute refractory period coincides with pretty much the entire duration of the action potential. It is caused by the inactivation in neurons.
What is the difference between the effective refractory period and the relative refractory period?
-The effective refractory period is the time in which the cell is incapable of responding to a second stimulus between the phases of 0-3.5, while the relative refractory period is the time in which the cell is making preparations to receive stimulus between phase 3.5-4.
What is the channel responsible for absolute refractory period?
Na+ channels influx (phase 0) then L-type Ca 2+ (slow calcium channels) to maintain the plateau (phase 2) then the first half of phase 3 - where voltage-gated and the delayed (iK1) k+ channels are starting to open and the Ca++ are starting to close. Phases 0-3.5 this is the absolute refractory period - PERIOD
How long does the refractory period last?
about 2 and a half minutes
Which term refers to the period whereby no impuls can be generated even with intence stimulation?
absolute refactory period
2 Define refractory period and differentiate between absolute and relative refractory periods?
refractory period is the interval between action potential , the absolute refractory period is the period in which second action potential can not be initiated but in relative refractory period the second action potential can be initiated by the more strong stimulus.
What is the absolute refractory period?
Absolute Refractory Period:It is the interval during which a second action potential absolutely cannot be initiated, no matter how large a stimulus is applied.ORAfter repolarization there is a period during which a second action potential cannot be initiated, no matter how large a stimulus current is applied to the neuron. This is called the absolute refractory period, and it is followed by a relative refractory period, during which another action potential can be generated
Define the period of repolarization when only a strong stimulus will elicit an action potential?
Relative refractory period
Which term referes to the period whereby no impulse can be generated even with intense stimulation?
Absolute refactory period
Period of reploarization of the neuron during which it cannot respond to a second stimulus?
The absolute refractory period. This period occurs after the action potential has been initiated and is a result of inactivation of the sodium channels. These sodium channels would normally open up to allow sodium influx into the cell during an action potential. The absolute refractory period occurs during an ongoing action potential and is the period in which a subsequent action potential absolutely cannot be generated.This should not be confused with the relative refractory period which occurs immediately following the absolute refractory period (during membrane hyperpolarization). During this period a subsequent action potential is possible, but more difficult to attain.
A period after an initial stimulus when a neuron is not sensitive to another stimulus is the?
After the generation and propagation of an action potential along a neuron, the cell becomes depolarized to the point where there is no potential for further signaling until the cell re-polarizes through the action of ion pumps. This very brief period is called the refractory state.
When do you use relative refractory period?
The relative refractory period is the time during which the generation of an action potential is impossible no matter the strength of the stimulus
How long is absolute refractory period for skeletal muscles?
The refractory period generally lasts one millisecond
What causes absolute refractory period?
The absolute refractory period coincides with pretty much the entire duration of the action potential. It is caused by the inactivation in neurons.
What is the difference between the effective refractory period and the relative refractory period?
-The effective refractory period is the time in which the cell is incapable of responding to a second stimulus between the phases of 0-3.5, while the relative refractory period is the time in which the cell is making preparations to receive stimulus between phase 3.5-4.
What is the cause of the relative refractory period?
The Refractory period is when a second action potential is possible, but unlikely; second action potential only if the stimulus is sufficiently strong. The refractory period helps to prevent backflow of Sodium.
What is an exceptionally strong stimulus that can trigger a response?
Relative refractory period
