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19 correct which of the following statements is not

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19CORRECTWhich of the following statements is NOT correct about ion channels?A)they are transmembrane proteinsB)they are protein molecules with a channel in the middle through which ions can move across cellmembranesC)they occur mainly in electrically excitable cells such as muscle and brain cellsD)each type of ion channel is usually specific for a particular ion speciesE)they may be voltage activated or ligand activatedFeedback:C is incorrect while all other statements are correct. Ion channels are ubiquitous since their functions arecritical for regulation of ions (electrolytes) across cell membrane and therefore are essential for formationand maintenance of membrane potential. Any cell that has membrane potential will have ion channels. Ionchannels also contribute to cell volume regulation since they influence the movement of water across cellmembranes as well.Reference: [See pp. 111-113; Figs. 4.5 (a-c)].
20CORRECTThought Question: Knowing that Na-K-ATPase is the molecular basis of Na-K-pump and knowing that this pumpextrudes Na ions and brings in K ions, can you tell which of the following tissues is likely to have the highest levelof Na-K-ATPase activity (i.e. Na pump) in their membranes?
Reference: [See pp. 116 - 117].E-mail Your ResultsDate: Thu Mar 01 2012 11:45:38 GMT-0500 (EST)My name:Section ID:E-mail these results to:E-mail address:Format:Me:HTMLMy Instructor:HTMLMy TA:HTMLOther:HTMLE-mail The Results
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Term
Spring
Professor
ZAHN
Tags
Sodium, brain cells

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