The membrane potential across a cell membrane can be thought of as a "blend" or weighted average of  a. the concentrations of Na+ and K+ ions in the extracellular fluid  b. the concetrations of Na+ and K+ ions in the cytoplasm  c. the concentrations of all permeable ions in the cytoplasm  d. the membrane potenial before and after the action potential  e. None of the above answer choices correctly completes the sentence

Could some one explain the correct answer for the question in the drop down box

Fill in the diagram, your illustration should demonstrate for each phase of the AP: 1. The relative concentration of K and Na 2. The relative voltage across the membrane 3. Any movement across the membrane of K and NA 4. The three kinds of channels in the membrane, and their state (open or closed) 5. Finally, indicate on the graph of the AP which phases correspond to hyper- polarization and which phases correspond to de- polarization Outside Outside Inside Inside Outside Inside Outside 1 Outside Inside Inside

What is the most important thing, i.e. what has the biggest impact of determining the resting membrane potential of a cell?