Physics please help

During an action potential, Na^+ ions move into the cell at a rate of about 3x10^-7 mol/m^2*s.

How much power must be produced by the "active Na^+ pumping" system to produce this flow against a +30-mV potential difference? Assume that the axon is 40cm long and 30um in diameter.

Please help me out I am lost. Thanks

  1. 0
  2. 0
  3. 25
asked by John
  1. I am not familiar with the terminology. How can a "potential" be an event or a time interval?

    Power = (current) x (voltage)

    The voltage is apparently 30*10^-3 V

    Convert the 3x10^-7 mol/(m^2*s) to
    coulombs/(m^2*s)
    1 mole of Na+ ions contains 6.02*10^23 ions with a charge of 9.63*10^4 Coulombs. Your ion flux is 2.89*10^-2 Amps/m^2

    Multiply that by the appropriate axon area.

    1. 0
    2. 0
    posted by drwls
  2. Can you please help out am still stuck one this

    1. 0
    2. 0
    posted by John
  3. During an action potential, Na^+ ions move into the cell at a rate of about 3x10^-7 mol/m^2*s.

    How much power must be produced by the "active Na^+ pumping" system to produce this flow against a +30-mV potential difference? Assume that the axon is 40cm long and 30um in diameter.

    Please help me out I am lost. Thanks
    Physics please help - drwls, Sunday, February 10, 2013 at 12:52pm
    I am not familiar with the terminology. How can a "potential" be an event or a time interval?

    Power = (current) x (voltage)

    The voltage is apparently 30*10^-3 V

    Convert the 3x10^-7 mol/(m^2*s) to
    coulombs/(m^2*s)
    1 mole of Na+ ions contains 6.02*10^23 ions with a charge of 9.63*10^4 Coulombs. Your ion flux is 2.89*10^-2 Amps/m^2

    Multiply that by the appropriate axon area.
    Physics please help - John, Tuesday, February 12, 2013 at 1:25am



    Can you please help out am still stuck one this!!!

    1. 0
    2. 0
    posted by John
  4. I am really
    confue on this question so, pliz could you help answer me this question?

    1. 0
    2. 0
    posted by Job James

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    During an action potential, Na^+ ions move into the cell at a rate of about 3x10^-7 mol/m^2*s. How much power must be produced by the "active Na^+ pumping" system to produce this flow against a +30-mV potential difference? Assume

    asked by John on February 12, 2013
  2. chemistry

    I did a lab using an electrochemical cell to establish a relationship between cell potential and concentration. I derived two equations from lines of best fit. One is Cell potential of Ag vs. Cu Concentration: y =

    asked by Morgan on November 11, 2010
  3. biology

    Hi, I appreciate your expert help,and I have a question for you. If I'm asked to decribe resting potential, action poential, and synaptic transmission,in point form;would the following responses be right? Resting Potential:

    asked by Cliff on April 6, 2011
  4. human anatomy and physiology

    cells are the basic unit of life based on the original cell theory. name and define the function of at least nine organelles of animal cells. You will find a list of 14 cell organelles and their functions (what they do) at:

    asked by Kristen on August 23, 2005
  5. ap bio

    15. The threshold potential is of great significance in the physiology of neurons because if the threshold potential is not reached, __________. A.the neuron cannot regain its resting potential B.the action potential will be

    asked by carol on November 6, 2008
  6. human anatomy-nervous system

    I am a little confused about the action potential concept (see nervous system) I have 3 multiple-choice questions that I need help with: Which is the correct sequence of events that follows a threshold potential: 1.the membrane

    asked by Sarah on December 2, 2006
  7. bi

    In an action potential, what ions are entering or leaving the cell during each of its phases.

    asked by yo on October 31, 2006
  8. ChemISTRY (WEBWORK)

    A student measures the potential for cells containing A+B+and C+ ions and their metals and records his data in the table below: ............. Overall Reaction ................Potential (V) Cell#1'''''''A(s) A+(aq) B+(aq)

    asked by laila on July 14, 2010
  9. Chemistry

    Cadmium and a solution of cadmium(II) nitrate are used with tin and a solution of tin(II) nitrate to construct a galvanic cell. 1) The reaction run initially at standard state with 100-mL samples of each solution is allowed to

    asked by chamy on April 29, 2012
  10. Chemistry

    The following galvanic cell at standard conditions has a potential of 0.03 V: Ag+(aq) + Fe2+(aq) → Fe3+(aq) + Ag(s). What would be the effect of increasing the concentration of Ag+? A. The cell potential will decrease. B. The

    asked by Morgan on October 20, 2014

More Similar Questions