Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    13
    In my book it says that potassium and the sodium-potassium pump creates and maintains the resting potential, but why isn't the sodium channels mentioned?

    And how do the potassium channels do that?
    Offline

    3
    ReputationRep:
    The sodium potassium pump pumps 3 Na out and 2 K in. Because there are more K ion channels open than Na, then more K diffuses out along the concentration gradient. This causes the inside of the membrane to become less positive (less positive ions inside), this therefore means that potassium ions are attracted to the inside of the membrane.
    So the sodium channels are not mentioned because they are closed and most potassium channels are open, allowing the diffusion of the ions.
    Offline

    14
    ReputationRep:
    As far as I recall the sodium channels only open briefly for an action potential, so don't contribute to resting potential
    • Thread Starter
    Offline

    13
    (Original post by wabbit998)
    The sodium potassium pump pumps 3 Na out and 2 K in. Because there are more K ion channels open than Na, then more K diffuses out along the concentration gradient. This causes the inside of the membrane to become less positive (less positive ions inside), this therefore means that potassium ions are attracted to the inside of the membrane.
    So the sodium channels are not mentioned because they are closed and most potassium channels are open, allowing the diffusion of the ions.
    (Original post by Chwirkytheappleboy)
    As far as I recall the sodium channels only open briefly for an action potential, so don't contribute to resting potential
    so are sodium channels and sodium voltage gates the same?
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Brussels sprouts
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.