Neurons exhibit a threshold above which an action potential is triggered because of:

Neurons exhibit a threshold above which an action potential is triggered because of:

Neurons exhibit a threshold above which an action potential is triggered because of:





  1. a positive feedback loop between sodium current activation and potassium inactivation.
  2. a positive feedback loop between depolarization and sodium current activation.
  3. a negative feedback loop between sodium current activation and inactivation.
  4. the precise time constant of sodium channel activation (i.e., a threshold would not be observed if this were measurably changed).
  5. pacemaker-like activity that is present in all nerve cells.

Answer: 2