You are going to record RMP from a cell using an electrode. You place your electrode and record a resting membrane potential every millisecond. You record an initial value of –70mV; however, over time you notice that your recordings become more and more positive until the RMP reaches 0mV. Assuming that Na+ and K+ are the major determinants of RMP in this cell, which of the following could best explain your results? The cell's Na+-K+ ATPase pumps have stopped functioning. The cell is becoming depleted of K+. The cell's K+ leak channels have stopped functioning. The cell's Na+ leak channels have stopped functioning. The cell is becoming depleted of Na+.
Added by Felix C.
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Step 1: The initial resting membrane potential of -70mV indicates that the cell is in a state of equilibrium where the inward and outward movement of ions (such as Na+ and K+) is balanced. Show more…
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All of the following statements about resting membrane potential (RMP) are correct except: - While RMP is maintained, there are many open potassium channels. - The sodium-potassium pump actively transports ions. - Neurons are negatively charged inside compared to outside. - K+ passively diffuses out faster than Na+ diffuses in. - The internal potassium concentration is around 5 mM.
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You are recording from several neurons. You tested out where the threshold potential is of all cells. Just above threshold, the shape of the action potentials of the cells you record from look different and kind of like this: What could explain the differences in amplitude, and the slope of the rising and falling phase of these action potentials? SELECT ALL THAT APPLY A. In cell A more voltage gated sodium channels are available than in cell B. B. In cell B more potassium channels are available than in cell A C. In cell A the threshold potential is more negative, while the Na equilibrium potential is the same, leading to a greater driving force for sodium to enter the cell once channels open up than in cell B. D. In cell A the equilibrium potential for sodium is higher (more positive) than in cell C. E. In cell C more potassium channels are available than in cell A
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