Relative Permeabilities of the Na and K Channels in Axon Membranes
Ion
Na+ channel
K+ channel
Li
0.93
<0.01
Na
1.00
<0.01
K
0.09
1.00
Rb
<0.01
0.91
Cs
<0.01
<0.08
NH4
0.16
0.13
HONH
3
(hydroxylamine)
0.94
<0.03
HN
2
NH3 (hydrazine)
0.59
<0.03