A change in environment, Receptors, Sensory Neurone, Stimulus, Central nervous system, Cells in sense organs that detect stimuli, Effector, Stimulus, Motor Neuron, Receptors, Takes messages from the sense organs to the CNS, Receptors, Sensory Neuron, Stimulus, Effector, Takes messages from the CNS to the effector, Motor Neuron, Stimulus, Effector, Receptors, Muscle or gland that brings about a response, Effector, Central nervous system, Sensory neuron, Stimulus, Brain or spinal cord, Stimulus, Central nervous system, Receptors, Effector

Nervous system

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