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The senses are composed of sensory receptors and, when activated, it sends a electrochemical signal to an attached neuron. That neuron does the same to another attached neuron and eventually the signal reaches the brain, where you process the information. If you were to touch a hot stove a sensory nerve specified for a temperature rise would be activated and send a signal to the brain and in a split second you take your hand or finger off before you burn your skin. The tongue (as well as other parts of the mouth) has taste receptors that sense a specific taste. The nose has much of the same thing, but instead of tasting a solid or liquid, it tastes or smells gas particles. The ear is more complicated. When there is sound or vibration in the air, the sound waves travel inside the air and eventually to the ear drum. It vibrates and sends a signal to the brain. The eyes have optical nerves that respond to what wavelength of light is penetrating it.

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