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The integumentary system (the skin, hair, nails and cutaneous glands) works by essentially containing all the inner organs and structures of the body. It has many functions as well besides protection. The cells of the skin are packed with keratin and linked by desmosomes which protect against organisms and water getting in. It also prevents losing too much water and blocks UV radiation. Nerve endings in the skin alerts the brain to temperature, touch and pressure and vasconstriction of blood vessels prevents too much heat loss. It aids in the synthesis of vitamin D and is important in communication especially through facial movements.

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Q: How does ingumentary system work?
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