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At resting membrane potential, the axonal membrane is impermeable to which ions?
- a)Calcium ions
- b)Sodium ions
- c)Potassium ions
- d)Chlorine ions
Correct answer is option 'B'. Can you explain this answer?
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At resting membrane potential, the axonal membrane is impermeable to w...
The axonal membrane of the neuron or nerve cell is semi-permeable in nature. At resting membrane potential, the membrane is permeable to potassium ions but nearly impermeable to sodium ions.
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At resting membrane potential, the axonal membrane is impermeable to w...
Resting Membrane Potential and Ion Permeability
The resting membrane potential is the electrical charge difference across the axonal membrane when a neuron is not sending any signals. At this state, the axonal membrane is impermeable to certain ions, primarily sodium ions.
Impermeable to Sodium Ions
- The axonal membrane at resting potential has closed sodium channels, preventing the influx of sodium ions into the cell.
- This impermeability to sodium ions is crucial for maintaining the resting membrane potential, as any influx of sodium ions would depolarize the membrane and initiate an action potential.
Permeable to Potassium Ions
- While sodium ions are blocked, the axonal membrane is permeable to potassium ions at resting potential.
- Potassium channels are partially open, allowing a small amount of potassium ions to leak out of the cell, contributing to the negative charge inside the cell.
Role of Other Ions
- Calcium ions, chlorine ions, and other ions also play specific roles in neuronal function but are not involved in the primary maintenance of the resting membrane potential.
- Calcium ions, for example, are involved in neurotransmitter release and signal transduction rather than membrane potential maintenance at rest.
In summary, at resting membrane potential, the axonal membrane is impermeable to sodium ions, which helps to establish and maintain the negative charge inside the cell. This selective ion permeability is essential for proper neuronal function and signal transmission.
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At resting membrane potential, the axonal membrane is impermeable to which ions?a)Calcium ionsb)Sodium ionsc)Potassium ionsd)Chlorine ionsCorrect answer is option 'B'. Can you explain this answer?
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