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- Name the tissue type composing the epidermis. List its major layers and describe the functions of each layer.Describe how the skin contributes to the regulation of body temperature, storage of blood, protection, sensation, excretion and absorption, and synthesis of vitamin D. Thermoregulation Blood reservoir Protection Cutaneous sensation Excretion and absorption Synthesis of vitamin DDescribe the types of cells found in the epidermis and explain their functions .