Which of the following was not seen in the voltage-clamp study of squid action potentials?

Which of the following was not seen in the voltage-clamp study of squid action potentials?

Which of the following was not seen in the voltage-clamp study of squid action potentials?



  1. Capacitive currents in response to hyperpolarizing voltage steps
  2. Capacitive currents in response to depolarizing voltage steps
  3. A transient inward current as a result of depolarization
  4. A sustained outward current as a result of hyperpolarization
  5. All of the above were seen in squid giant axons.

Answer: 4