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"The integumentary system consists of the skin, hair, nails, the subcutaneous tissue below the skin, and assorted glands. The most obvious function of the integumentary system is the protection that the skin gives to underlying tissues. ... These are all exocrine glands, secreting materials outside the cells and body.

By helping to synthesize and absorb vitamin D, the integumentary system works with the digestive system to encourage the uptake of calcium from our diet. ... The integumentary system also works closely with the circulatory system and the surface capillaries through your body.

It acts as a barrier between invaders (pathogens) and your body. Skin forms a waterproof mechanical barrier. Microorganisms that live all over your skin can't get through your skin unless it's broken."