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The rise in stimulus-induced permeability to
a. Potassium ions
b. Sodium ions
c. Restoring RMP
d. Diffusion of potassium ions
a. Potassium ions
b. Sodium ions
c. Restoring RMP
d. Diffusion of potassium ions
Arrange them in order.
- a)b-a-c-d
- b)a-b-c-d
- c)b-a-d-c
- d)c-a-d-b
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The rise in stimulus-induced permeability toa. Potassium ionsb. Sodium...
The electrical potential difference across the resting plasma membrane is called as the resting potential.The rise in the stimulus-induced permeability to Na+ is extremely shortlived. It is quickly followed by a rise in permeability to K+. Within a fraction of a second, K+ diffuses outside the membrane and restores the resting potential of the membrane at the site of excitation and the fibre becomes once more responsive to further stimulation.
Topic in NCERT: Generation and Conduction of Nerve ImpulseLine in NCERT: "The rise in the stimulus-induced permeability to Na* is extremely short-lived. It is quickly followed by a rise in permeability to K*. Within a fraction of a second, K+ diffuses outside the membrane and restores the resting potential of the membrane at the site of excitation and the fibre becomes once more responsive to further stimulation."
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The rise in stimulus-induced permeability toa. Potassium ionsb. Sodium...
Understanding the Sequence of Events
In the context of neuronal action potentials and membrane permeability, the sequence of events following a stimulus is crucial. Here's the breakdown of the correct order:
1. Rise in Stimulus-Induced Permeability
- The initial step involves a rise in membrane permeability to specific ions.
- This permeability change is often triggered by a stimulus, such as neurotransmitter release or mechanical stimulation.
2. Diffusion of Potassium Ions
- After the permeability to sodium ions increases, potassium ion channels may also open.
- Potassium ions will begin to diffuse out of the cell, contributing to the repolarization phase of the action potential.
3. Restoring Resting Membrane Potential (RMP)
- As potassium ions exit the neuron, the membrane potential begins to return to its resting state.
- This restoration occurs as the cell becomes less positive inside, eventually stabilizing at the RMP.
4. Rise in Permeability to Sodium Ions
- Initially, the permeability rises for sodium ions, allowing them to enter the neuron.
- This influx of sodium causes depolarization, leading to the action potential spike.
Conclusion
- Therefore, the correct order of events is: Rise in stimulus-induced permeability (to sodium), diffusion of potassium ions, restoring RMP, and finally, the impact of sodium ion permeability.
- Hence, the correct sequence is option 'c': b-a-d-c.
Understanding this sequence is key in grasping how neurons communicate and respond to stimuli, especially during action potentials.
In the context of neuronal action potentials and membrane permeability, the sequence of events following a stimulus is crucial. Here's the breakdown of the correct order:
1. Rise in Stimulus-Induced Permeability
- The initial step involves a rise in membrane permeability to specific ions.
- This permeability change is often triggered by a stimulus, such as neurotransmitter release or mechanical stimulation.
2. Diffusion of Potassium Ions
- After the permeability to sodium ions increases, potassium ion channels may also open.
- Potassium ions will begin to diffuse out of the cell, contributing to the repolarization phase of the action potential.
3. Restoring Resting Membrane Potential (RMP)
- As potassium ions exit the neuron, the membrane potential begins to return to its resting state.
- This restoration occurs as the cell becomes less positive inside, eventually stabilizing at the RMP.
4. Rise in Permeability to Sodium Ions
- Initially, the permeability rises for sodium ions, allowing them to enter the neuron.
- This influx of sodium causes depolarization, leading to the action potential spike.
Conclusion
- Therefore, the correct order of events is: Rise in stimulus-induced permeability (to sodium), diffusion of potassium ions, restoring RMP, and finally, the impact of sodium ion permeability.
- Hence, the correct sequence is option 'c': b-a-d-c.
Understanding this sequence is key in grasping how neurons communicate and respond to stimuli, especially during action potentials.
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