Which of the following is not an observation that helped to identify sodium as the early current of the action potential?

Which of the following is not an observation that helped to identify sodium as the early current of the action potential?

Which of the following is not an observation that helped to identify sodium as the early current of the action potential?




  1. The current declined when there was decreased driving force on sodium fluxes.
  2. The current disappeared near the Nernst potential for sodium.
  3. The early current was blocked by tetrodotoxin.
  4. The early current was unaffected by tetraethylammonium.
  5. When the late current was blocked, the reversal potential of the inward current shifted to a negative membrane potential.
Answer: 5