PATHOLOGY MCQ
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 are protein molecules that span across the cell membrane allowing the passage of ions from one side of the membrane to the other. They have an aqueous pore, which becomes accessible to ions after a conformational change in the protein structure that causes the ion channel to open.
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