The nerve membrane is freely permeable to potassium, although there is a Na+/K+ ATPase that pumps 3 Na+ in and 2 K+ out.
The resting potential is around -60mV to -70mV
The driving force of Na+ is inwards, as is Cl- and Ca2+, while the driving force of K+ faces outwards.
K+ wants to go down its concentration gradient (there is more K+ in the cell than out of the cell).
Na+ wants to go down its concentration and electrical gradient (it's more negative inside the cell and there's less Na+ there).
The permeability of a cell is determined by the number of channels it has, the length the channels are open, and the conductivity of each channel to a particular ion.
The Nernst potential for Na+ is +65, while it is around -95 for K+.
permeabiity
The polarity of membrane phospholipids -Mastering Biology
Cell membrane
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Through something called "Selective permeability"
permeabiity
The polarity of membrane phospholipids -Mastering Biology
Changes in permeability are changes in the number of compounds that can pass through a membrane. The presence of certain chemicals or radiation can change the permeability of a membrane.
permeability
permeability
permeability
It is the ability of the membrane to allow ions and/or particles to cross.
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Permeability
A membrane is selectively permeable.
Selective permeability refers to the fact that the plasma membrane can choose which molecules to let in or out of the cell.
Permeability