The paddle-like, charged transmembrane domains of potassium channels may confer ion selectivity to the channel. enable the aggregation of channel subunits into functional channels. O dehydrate the ions as they cross the membrane. serve as a plug or inactivation gate. be the primary voltage sensors.
The paddle-like, charged transmembrane domains of potassium channels may confer ion selectivity to the channel. enable the aggregation of channel subunits into functional channels. O dehydrate the ions as they cross the membrane. serve as a plug or inactivation gate. be the primary voltage sensors.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:The paddle-like, charged transmembrane domains of potassium channels may
confer ion selectivity to the channel.
enable the aggregation of channel subunits into functional channels.
O dehydrate the ions as they cross the membrane.
serve as a plug or inactivation gate.
be the primary voltage sensors.

Transcribed Image Text:Which evidence supports the assertion that the macroscopic Na + current is the sum of
many microscopic Na + currents?
All of the other choices
Tetrodotoxin blocks macroscopic, but not microscopic, currents.
Opening and closing of Na + channels is concentration-dependent.
The averaged collective response of single channels resembles the time course of the macroscopic
current.
The probability of a Na+ channel opening increases as the membrane is hyperpolarized.
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