1. Stimuli: physical or chemical signal (ex. hot room) - 2. Nerve impulse (ex. sends signal to brain) - 3. Effectors: muscle & glands react (ex. sweat glands start sweating)

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1. 1. Stimuli: physical or chemical signal (ex. hot room) - 2. Nerve impulse (ex. sends signal to brain) - 3. Effectors: muscle & glands react (ex. sweat glands start sweating)