Question
The cell membrane of a cell is freely permeable to three ions X, Y, and Z. At resting membrane potential, the respective equilibrium potentials of X and Y are -30mV and -40 mV. What will happen to the membrane potential if a drug is infused which can block the permeability of Z?
| A. |
Depolarisation |
| B. |
Hyperpolarization |
| C. |
No change |
| D. | Hyperpolarization following repolarization |
Show Answer
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Correct Answer � A Explanation |
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Ans. A. Depolarisation
- In this question if Z has a reversal potential or original RMP was more negative (e.g., -70 or -90 mV) then closure of C ion channels would shift the RMP closer to reversal potential of A, B thus depolarising the cell.