The answer is the SKIN.
Skin is an Organ.
Its purposes include more than simply keeping bodily fluids in and germs out like a balloon . It also receives & transmits information from the outside world to the central nervous system. Information about light, touch, deeper pressure, hot, cold, and even pain is collected by special receptors in the skin's layers.
Source Book - Pyschology by Saundra K. Ciccarelli & j. Noland White
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