The integument is a multitasking system. In addition to protection, the skin also provides a location for receptors to detect our external environment, and because is so large, it is a reservoir for blood. Each layer contributes to the overall functions of the skin in unique ways. Drag and drop each item to the appropriate bin. Solution EPIDERMIS Pigmentation Water resistance Vitamin D synthesis Water retention DERMIS Elasticity Thermoregulation Sensation Excretion HYPODERMIS Insulation Fat storage Connect skin with body.