Which observation is not evdience that helped identify sodium a s the early current of the action potentioa?
a. The current declined when there was decreased driving force on sodium fluxes.b. The current disappeared near the Nernst potential for sodium.c. The early current was blocked by tetrodotoxin.d. The early current was unaffected by tetraethylammonium.e. When the late current was blocked, the reversal potential of the inward current shifted to a negative membrane potential.

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22-07-2022
Biology

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Which observation is not evdience that helped identify sodium a s the early current of the action potentioa?
a. The current declined when there was decreased driving force on sodium fluxes.b. The current disappeared near the Nernst potential for sodium.c. The early current was blocked by tetrodotoxin.d. The early current was unaffected by tetraethylammonium.e. When the late current was blocked, the reversal potential of the inward current shifted to a negative membrane potential.

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Vickynehra Vickynehra · Answer 1 · 2022-08-02T15:28:46+02:00

Option e: When the late current was blocked, the reversal potential of the inward current shifted to a negative membrane potential. This observation is not an evidence that helped identify sodium a s the early current of the action potential.

Reversal potential is the potential at which the current reverses direction: it changes from positive to negative.

During a typical action potential, the small resting ion conductance mediated by potassium channels is overwhelmed by the opening of numerous Na+ (sodium ion) channels.

This brings the membrane potential towards the reversal potential of sodium.

To learn more about Reverse potential ,here

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