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RMP
Chapter 11 - A & P Lecture
| Question | Answer |
|---|---|
| concentration of K+ higher inside & | Na+ higher outside |
| due to K+ leak channels, plasma membrane is | 50-100 times more permeable to K+ than other ions |
| plasma membrane is is impermeable to large, neg. charged molecules (proteins) | so these anions are trapped inside the cell |
| K+ diffuses across plasma mebrane from | inside to outside |
| because neg. charged molecules cannot follow pos. charged K+, a | small neg. charge develops inside membrane |
| neg. charge inside attracts pos. charge. | when neg. charge inside enough equilibrium is established |
| charge difference across membrane at equilibrium is | a reflected difference in potential (mV) |
| resting membrane potential is proportional to the potential | for K+ to diffuse out of cell but not the actual rate of flow for K+ |
| at equilibrium, very little | movement of ions takes place across membrane |