The Sensory System. By: Derek, John and Chris. What is the Sensory System?.
By: Derek, John and Chris
Gating of ion channels in specialized receptor membranes allows a change in ion fluxes across the membrane, generating a graded receptor potential. The graded potential initiates an action potential, frequency and NOT magnitude of which is determined by magnitude of the graded potential. Magnitude of the receptor potential is determined by stimulus strength, summation of receptor potentials, and receptor sensitivity. The decrease in sensitivity with a constant stimulus is called adaptation.
Sensations from skin, muscles, bone are initiated by somatic receptors. Receptors for visceral sensations are similar.