Review Sheet Results Essay

1. Explain why increasing extra stallular K+ reduces the mesh topology diffusion of K+ out of the neuron through the K+ efflux channels. Your answer Because outside a typical cellular phone, the tightfistedness of K+ is some 5mM and the concentration of Na+ is about cl mM. When you increase the concentration of K+ from 5 to 25 mM and reduce concentration of Na+ from 150 to 130 mM, the outside has more concentration of K+. The tissue layer is pervious to a particular ion, that ion will string out down its concentration gradient from a region of higher concentration to a region of set down concentration. 2. Explain why increasing extracellular K+ causes the membrane authorisation to change to a less negative value. How well did the results compare with your divination? Your answerBecause outside has more K+, the rate of diffusion is less. The resting membrane potential will become less negative. 3. Explain why a change in extracellular Na+ did not significantly modify the membrane potential in the resting neuron? Your answer Because it did not instal the resting membrane potential.4. Discuss the relative permeability of the membrane to Na+ and K+ in a resting neuron. Your answer The resting membrane potential is really a potential difference between the inside of the cell (intracellular) and the outside of the cell (extracellular) across the resting permeability of the membrane to ions and on the intracellular and extracellular concentraions of those ions to which the membrane is permeable. Na+ and K+ are the most important ions, and the concentrations of these ions are establish by transport protein, such as the Na+ -K+ pump, so that the intracellular Na+ concentration is low and the intracellular K+ concentraion is high. The ions will diffuse down its concentration gradient from a region of higher concentration to a region of lower concentration. 5. Discuss how a change in Na+ or K+ conductance would affect the resting membrane potential. Your an swerThe resting boundary potential is a potential difference between the inside of the cell and the outside of the cell across the membrane. It depends on the resting permeability of the membrane to ions and on the intracellular and extracellular concentrations of those ions to which the membrane is permeable.View as multi-pages