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What is skin? The layers of human skin

The skin is the largest organ of the human body, weighing approximately 16% of our bodyweight. Skin consists of multiple layers, epidermis, dermis and hypodermis.

Human skin has numerous functions, it is the major interface between the environment and the human organs and so it serves many specialised functions that facilitate survival.

It regulates body temperature to protect against hyperthermia and hypothermia. Skin protects from the invasion of noxious substances, UV light, heat and micro-organisms.

The skin is also the most extensive sensory organ of the body for detection of tactile, thermal and painful stimuli for the start of vitamin D production.