Which of the following statements about voltage-gated sodium channels is true?
a. All cells contain voltage-gated sodium channels.
b. Voltage-gated sodium channels are integral membrane proteins.
c. Voltage-gated sodium channels have roughly equal permeability to Na+ and K+.
d. Voltage-gated sodium channels open in response to any change in membrane potential.
e. Voltage-gated sodium channels open in response to binding of acetylcholine.
B
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