stimulus - a change (increase or a decrease) in the level of an internal or external variable, receptor - detects the change and sends information to the modulator, modulator - evaluates the changes against the set point for that variable and sends signals to the effector about the correction needed, effector - a molecule (normally a hormone) which adjusts its output to make the required correction, response - a change after the stimulation from the initial signal,

Stimulus response model

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