In an experiment using a series of voltage steps to study the two different ionic currents associated with the action potential, it was found that:

In an experiment using a series of voltage steps to study the two different ionic currents associated with the action potential, it was found that:

In an experiment using a series of voltage steps to study the two different ionic currents associated with the action potential, it was found that:




  1. both currents had the exact same voltage dependence.
  2. both currents increased monotonically with increasingly large voltage steps.
  3. both currents decreased with increasingly large voltage steps.
  4. the early current increased initially, but then it decreased in size as the voltage step was increased.
  5. the late current increased initially, but then it decreased in size as the voltage step was increased.

Answer: 4