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    				| 1. | Resting membrane potential is maintained byA. hormonesB. neurotransmittersC. ion pumpsD. None of these | 
| Answer» The ionic gradients across the resting membrane are maintained by the active transport of ions by the sodium-potassium pumps (or ion pumps) which transport `3 Na^(+)` outward for every `2K^(+)` into the cell. | |