BIO SCI N110 Study Guide - Midterm Guide: Axoplasm, Ion Transporter, Perfect Conductor
20 Apr 2019
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If alternator fails, you can still drive a small amount because of the energy that is stored in the battery. Similarly, if ion pump in a nerve cell is poisoned, cell still works using concentration gradient as energy source. This suggests that outside conc. of potassium sets resting potential: bottom graph: initially, shallow slope as permeability to other ions is significant. Then above 20 mm, slope = 58 mv (same as what. This shows that at rest the membrane is only permeable to potassium ions. Ionic basis of the action potential: peak height of action potential depends on outside concentration of na+ ions. If extracellular sodium decreases, ap has a lower peak. Resting potential is unchanged b/c that only depends on k+, not na+: red line = voltage at peak of action potential. Slope = 58 mv per tenfold change in concentration gradient: green like = resting potential.
