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A period after an initial stimulus when a neuron is not sensitive to another stimulus is the?
refractory period. This is a brief time after a neuron has fired an action potential, during which it cannot generate another action potential in response to a new stimulus. This period is crucial for maintaining the directionality of signal transmission in the nervous system.
What happens if the membrane breaks during the process"?
If the membrane breaks during the process, it can lead to the loss of cell contents and disrupt the cell's ability to function properly.
Can you provide an example of a refractory period in the context of human physiology?
In human physiology, a refractory period refers to a brief period of time after a nerve or muscle cell has been activated where it is temporarily unable to respond to another stimulus. An example of this is the refractory period in cardiac muscle cells, where after a heartbeat, there is a brief period where the muscle cell cannot contract again immediately. This helps regulate the heart's rhythm and prevent irregular heartbeats.
What happens during the G hase?
During the G2 phase of the cell cycle, the cell continues to grow and prepare for DNA replication. It is a checkpoint phase where the cell checks for any damage or errors before moving on to the next phase of the cycle. If conditions are favorable and the cell is healthy, it will proceed to the S phase for DNA replication.
What happens to the chromosome number during mitosis?
During mitosis, the chromosome number remains the same. The cell duplicates its chromosomes before dividing, so each daughter cell receives the same number of chromosomes as the parent cell.
A period after an initial stimulus when a neuron is not sensitive to another stimulus is the?
refractory period. This is a brief time after a neuron has fired an action potential, during which it cannot generate another action potential in response to a new stimulus. This period is crucial for maintaining the directionality of signal transmission in the nervous system.
What happens during the refractory period?
The voltage-gated Na+ channels get deactivated, thus the sodium ions cannot diffuse into the cell and cause depolarisation and this also provides time for the membrane to prepare for its second action potential.
What is occurring when a muscle cell cannot be stimulated during the absolute refractory period?
During the absolute refractory period, a muscle cell cannot be stimulated because it is in a state where it is unable to respond to any stimuli, no matter how strong. This period is caused by the inactivation of voltage-gated sodium channels and the inability to generate another action potential until these channels have returned to their resting state.
What is The time an action potential begins until the resting potential has stabilized is?
1/2500 sec is the absolute refractory 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.
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.
Why can't an action potential be generated during the absolute refractory period?
Action potentials cannot be generated during the absolute refractory period, as not enough ion channels are able to respond to the stimulus, no matter how large it is. Using Na+ fast channels as an example, during depolarization the "gate" of the channel is opened, allowing for Na+ influx into the cell. However, during the repolarization phase, a second "gate" marks the closure of the cell, preventing any further movement of ions into the cell. However, this also means that the channel is unable to open again until the second gate is removed, and the first gate returns back into place.
Which term refers to the period whereby no impuls can be generated even with intence stimulation?
The term for the period where no impulse can be generated despite intense stimulation is known as the absolute refractory period. During this time, the cell membrane is unable to propagate another action potential, ensuring that signals are unidirectional and preventing the possibility of signal backflow.
What are the cellular events responsible for the refractory period?
During the refractory period, the inactivation of voltage-gated sodium channels prevents the generation of a new action potential. This inactivation prevents the cell from firing another action potential immediately after one has just occurred. The refractory period also allows time for the ion concentrations in the cell to return to their resting state, ensuring proper signaling.
What happens during the S phase of the cell?
cell duplicates its DNA
When a cell divides during asexual reproduction describe what happens to DNA of the cell during this type of cell division?
the DNA will divide
What is the long refractory period?
The long refractory period refers to the period of time after an action potential during which a cell is unable to generate another action potential. This ensures that cells have enough time to recover before firing again, allowing for proper signaling and coordination in the nervous system.
