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Physiology Test Question
The channel pore of the nicotinic acetylcholine receptor is permeable to both Na
+
and K
+
. The relative
p
K
:
p
Na
permeability of the selectivity filter is:
(A)
1 : 1 (the channel pore is equally permeable to Na
+
and K
+
)
(B)
1 : 2 (the channel pore permeability to Na
+
is greater than the permeability to K
+
)
(C)
1 : 0.5 (the channel pore permeability to K
+
is greater than the permeability to Na
+
)
(D)
1 : 10 (the channel pore permeability to Na
+
is significantly greater than the permeability to K
+
)
(E)
1 : 0.1 (the channel pore permeability to K
+
is significantly greater than the permeability to Na
+
)
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Posted: Monday, September 1, 2014
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