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What is resting membrane potential and its typical value?
Difference in electrical charge across the membrane; resting inside is -65 mV
Why is the inside of a cell negatively charged at rest?
Higher concentration of negative ions and proteins inside, plus more positive ions outside.
Na+-K+pump
Moves 3 Na+ to the outside for every 2 K+ moved to
the inside
Helps keep the inside of the cell negative
How does the Na+-K+pump move ions, and does it require energy?
Ions are pumped against concentration gradients
Requires energy