QS Study

Differences between Receptor Potential and Action Potential

An action potential is the series of membrane potential changes that allows a suprathreshold stimulus followed by a return to the resting membrane potential and results in cell excitation. Receptor Potential is the transmembrane potential difference produced by activation of a sensory receptor. It is generally a depolarizing event resulting from an inward current flow.

Receptor Potentials

  1. Non propagated,
  2. Graded,
  3. Has no refractory period,
  4. Does not follow the all-or-none law,
  5. Not affected by local anesthetics,
  6. Originated in the non-myelinated portion of nerve terminal in the receptor,
  7. Produce by deformation of receptor and opening of ion channels of the nerve terminal

Fig: Receptor Potential and Action Potential

Action Potential

  1. Propagated,
  2. Non-graded,
  3. Has refractory period,
  4. Follow all or none law,
  5. Affected by local anesthetics,
  6. Originated in the first node of Ranvier within the receptor
  7. Produced when the generator potential rises to the threshold level (10 mv) which form a local circuit of current flow.
Related Study: