Receptor potential

The receptor potential (lat. receptor: Transducer, Receiver - Latin potentialis: by assets; acting acting) - generator potential is often used as a synonym - denotes a membrane electrical response of the receptors to a stimulus.

Some authors distinguish between receptor potential and generator potential: Depolarization in the membrane of a sensory neuron is called a generator potential. A receptor potential contrast caused in the membrane of a cell receptor.

The receptor potential is a direct consequence of the transduction process, the conversion of stimulus energy into endogenous arousal. The profile of the receptor for the potential application of a standard stimulus (e.g., stimulus of the step ) is different for the different receptors. Typical is one of a proportional and derivative ( see derivative sensitivity, proportional action ) composite potential.

The receptor potential is usually a result of the opening of sodium channels ( the distribution of sodium ions is the actual excitation) in the receptor cell. An exception is the receptor potential of the photo-sensors, in which the actual potential receptor is triggered by the closing of the sodium channels hyperpolarization.

The receptor potential does not follow the all-or -nothing law, ie it grows gradually with the strength of the stimulus. When reaching a certain threshold value ( threshold potential ) then takes an action potential, but which ( like almost all action potentials ) follows the all-or -nothing law. Also owns the receptor potential no refractory period.