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1.aYou have an animal cell at rest. Suppose that suddenly the membrane becomes equally permeable for sodium and potassium. Would you expect both ions to move across the membrane with the same speed? What would be the direction of displacement for each ion?
b. Explain how the permeability of the membrane changes at each phase of the action potential.



Answer :

Explanation:

A resting (non-signaling) neuron has a voltage across its membrane called the resting membrane potential, or simply the resting potential.

The resting potential is determined by concentration gradients of ions across the membrane and by membrane permeability to each type of ion.

In a resting neuron, there are concentration gradients across the membrane for

and

. Ions move down their gradients via channels, leading to a separation of charge that creates the resting potential.

The membrane is much more permeable to

than to

, so the resting potential is close to the equilibrium potential of

(the potential that would be generated by

if it were the only ion in the system).

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