How many K* ions are on the outside of the axon assuming an initial potential difference of 7.0 x 10-2 v? K* ions Is this a large charge per unit area? Hint: Calculate the charge per unit area in terms of electronic charge e per angstrom squared (Å2). An atom has a cross section of about 1 Å? (1 Å = 10-10 m). (Compare to normal atomic spacing of one atom every few Å.) Yes O No (b) How much positive charge must flow through the cell membrane to reach the excited state of +3.0 x 10-2 v from the resting state of -7.0 x 10-2 v? How many sodium ions (Na*) is this? Nat ions (c) If it takes 2.0 ms for the Na* ions to enter the axon, what is the average current in the axon wall in this process? (d) How much energy does it take to raise the potential of the inner axon wall to +3.0 × 10¬2 v, starting from the resting potential of –7.0 × 10¬2 v? (Assume that no energy is required to first raise the potential to 0 V from the resting potential of -7.0 × 10¬2 v.)
How many K* ions are on the outside of the axon assuming an initial potential difference of 7.0 x 10-2 v? K* ions Is this a large charge per unit area? Hint: Calculate the charge per unit area in terms of electronic charge e per angstrom squared (Å2). An atom has a cross section of about 1 Å? (1 Å = 10-10 m). (Compare to normal atomic spacing of one atom every few Å.) Yes O No (b) How much positive charge must flow through the cell membrane to reach the excited state of +3.0 x 10-2 v from the resting state of -7.0 x 10-2 v? How many sodium ions (Na*) is this? Nat ions (c) If it takes 2.0 ms for the Na* ions to enter the axon, what is the average current in the axon wall in this process? (d) How much energy does it take to raise the potential of the inner axon wall to +3.0 × 10¬2 v, starting from the resting potential of –7.0 × 10¬2 v? (Assume that no energy is required to first raise the potential to 0 V from the resting potential of -7.0 × 10¬2 v.)
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