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Thermoreceptors - respond to temperature
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change: example
heat and cold.
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Photoreceptors
- respond to light: example vision
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Chemoreceptors - respond to various chemicals
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such as glucose,
oxygen, carbon dioxide,
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hormones and
many, many more. [taste
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buds][olfactory cells]
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Nociceptors - pain receptors from any noxious
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stimulus [free
nerve endings]
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