ion motion across the cell membrane

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varo650
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ion motion across the cell membrane

Post by varo650 » Thu Nov 30, 2006 6:47 am

can anyone help me in answering this question:

what are the two distinct types of motion, regulated by membrane proteins, that maintain the disequilibrium of ionic species across the cell membrane?

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asutoshsahu
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Post by asutoshsahu » Thu Nov 30, 2006 12:53 pm

Different Ion channels mainly play a role in this.
Plasma membrane contains many integral protiens which can carry only certain type of ions into the cell or out of the cell particularly.
If we shall say about neuron then these cells have active Na+ K+ Exchange pump, Ca pump etc. which in resting stage maintain a membrane potential of -70 V across the membrane and change it subsequently according to need.

Membrane protiens like permeases help in fascilated diffusion of certain ions across the cell.

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MrMistery
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Post by MrMistery » Thu Nov 30, 2006 5:11 pm

correction
all animal cells have the Na/K antiporter, and the vast majority posses the Ca pump. All plant cells have the H+ pump, which plays the role of the Na/K pump in animals. Most organisms also posses other active transport mechanisms, such as the ABC transporter etc
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