Basic function Sequence of events in a Receptor tumulus Reception Receptor protein Activated Amplification Enzyme Cascade (in some cases) Receptor lon Channels opened (or closed) Receptor Current Transduction Receptor potential Modulated Transmitter Release from receptor cell Modulated Impulse Modulated Impulse Transmission Frequency in Second Frequency in receptor Order neuron Cell axonSequence of Events in a Receptor Stimulus Receptor Protein Activated Enzyme Cascade (in some cases) Receptor Ion Channels opened (or closed) Receptor Current Receptor Potential Modulated Impulse Frequency in Second Order Neuron Basic Function Reception Amplification Transduction Transmission Modulated Impulse Frequency in Receptor Cell Axon Modulated Transmitter Release from Receptor Cell