- Barrier function – the skin protects the internal structures of our body against injuries, and yet allows exchange of fluids and gases between the body and the environment.
- Temperature regulation – alteration of the rates of skin blood flow and sweating helps maintain our skin and body temperature.
- Protection -against harmful effects of ultraviolet light through our pigment cells.
- Sensory organ – through the specialized nerve endings in the skin, the body is able to perceive various sensations evoked by external agents.
- Metabolism – Vitamin D is produced through the interaction of ultraviolet light on precursors of vitamin D present in our skin.
- Immune function – the skin cells present in the epidermis protect the body against external agents.
- Water resistance – The skin acts as a water resistant barrier so essential nutrients aren't washed out of the body.
- Absorption through the skin – Oxygen, nitrogen and carbon dioxide can diffuse into the epidermis in small amounts.
