CIISUsed to of the following statements about membrane potential is false? Elect

Question

CIISUsed to of the following statements about membrane potential is false? Electrical imbalances across the membrane refers to the electrochemical gradient (a) The cytosolic side of the plasma membrane is usually at a negative potential (d) Changes in membrane potential are the basis of electrical signaling in many type of cells. 14. If Na' channels are opened in a cell that was previously at rest, how will the resting membrane potential Generate Ay It becomes more positive.? It becomes more negative. ( c) The membrane potential is not affected by Na. (d) Vcorrect It is permanently reset. 15. This figure illustrates changes in membrane potential during the formation of an action potential. Which of the following statements accurately describe the events involved in this step? () The gated Na and K' channels are closed (c) Depolarization opens most Na+channels, (d) Most Na" channels become inactivated, many K' channels Local depolarization causes nearby Na channels to open. while the K' channels remain closed have openecd 16. Cells use membranes to help maintain set ranges of ion concentrations inside and outside the cell. Which of the following ions is the most abundant inside à typical mammalian cell? a) Na S-15 K 140 Ca2 cr.rs IS-./Correc? 17. Choose the molecule that is more likely to diffuse through the lipid bilayer. (a) glucose Na c)) O2 (d) ethanol (c) glycerol couple 18. Which of the following statements is true about the the Na'-K pump? It derives energy or transport from an Na'-gradient. It is responsible for maintaining the high extracellular sodium potassium ion. concentration and the high intracellular potassium ion concentration. (a) (b) It is a symport for sodium and potassium transport da and b a, b, and c

Explanation / Answer

13)C because cytosolic side of plasma membrane is positively charge it have high concentration of Pottasium ions.

15)C depolarization open most of the Na channels, Pottasium channels remain close

17) C. Oxygen is a non polar substance so, diffuse more rapidly as compare to polar substances

18) D . Na channel is an active channel it requires ATP for opening and it also help in maintaining high concentration of Na ions outside the membrane and Pottasium ions inside the membrane

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