What would be the resting potential of a neuron if it were only permeable to Na+?
Table of Contents
- 1 What would be the resting potential of a neuron if it were only permeable to Na+?
- 2 Are neurons more permeable to Na+ or K+ at rest?
- 3 What is the membrane more permeable to K+ than Na+?
- 4 How a resting membrane potential is maintained in a neuron?
- 5 What is the resting potential when a neuron is not conducting an action potential?
What would be the resting potential of a neuron if it were only permeable to Na+?
Since the resting potential is -70mV, when the membrane becomes permeable to Na+ ions they flow in the direction which brings the membrane potential towards +53mV. Since Na+ ions are positively charged, they will flow INTO the cell, depolarizing the membrane potential in the directions of +53mV.
Are neurons more permeable to Na+ or K+ at rest?
The negative charge within the cell is created by the cell membrane being more permeable to potassium ion movement than sodium ion movement. In neurons, potassium ions are maintained at high concentrations within the cell while sodium ions are maintained at high concentrations outside of the cell.
What is the membrane more permeable to K+ than Na+?
The plasma membrane is much more permeable to K+ than to Na+.
When a neuron is at its resting potential?
The resting membrane potential of a neuron is about -70 mV (mV=millivolt) – this means that the inside of the neuron is 70 mV less than the outside. At rest, there are relatively more sodium ions outside the neuron and more potassium ions inside that neuron.
What is the relative permeability of the membrane to Na+ and K+ in a resting neuron?
Discuss the relative permeability of the membrane to Na+ and K+ in a resting neuron. Membrane permeability of a resting neuron to K+ is four to five times greater than for Na+.
How a resting membrane potential is maintained in a neuron?
Sodium-potassium pumps move two potassium ions inside the cell as three sodium ions are pumped out to maintain the negatively-charged membrane inside the cell; this helps maintain the resting potential.
What is the resting potential when a neuron is not conducting an action potential?
This means that some event (a stimulus) causes the resting potential to move toward 0 mV. When the depolarization reaches about -55 mV a neuron will fire an action potential. This is the threshold. If the neuron does not reach this critical threshold level, then no action potential will fire.