EMBRYOLOGY
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The “selectivity” of a particular ion channel refers to its
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permitting passage by negative but not positive ions.
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permitting passage by positive but not negative ions
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ability to change its size depending on the ion needing transport
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binding with only one type of neurotransmitter.
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permitting passage only to a specific ion.
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Explanation:
Detailed explanation-1: -Individual ion channels are specific to particular ions, meaning that they usually allow only a single type of ion to pass through them. Both the amino acids that line a channel and the physical width of the channel determine which ions are able to wiggle through from the cell exterior to its interior, and vice versa.
Detailed explanation-2: -Ion channels allow the formation of a concentration gradient between the extracellular fluid and the cytosol. Ion channels are very specific, as they allow only certain ions through the cell membrane.
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