signal transduction

Signal transduction involves the conversion of one signal or stimulus (mechanical or chemical) to another. The transduction process is usually performed by enzymes in association with second messengers.

Extracellular signals impinge upon specialized membranous receptors. Sensory transduction involves the conversion of mechanical or chemical stimuli to cellular signals or neurochemical signals. Intracellular signals enable communication within cells, while intercellular signals enable communication between cells.