Protection.The skin protects internal organs from injury and infection. Keratin in the outer cell layer prevents germs from invading the body. Skin’s elasticity withstands physical pressure and reduces injuries.
Regulation. Sweat secretions evaporate on the skin’s surface, thereby cooling the body and regulating its temperature.
Sensation. The skin is a sensory organ. Nerve endings in the epidermis respond to heat, cold, touch, pressure and pain.
Secretion. Skin secretes sebum from the sebaceous glands. Storage. Skin stores vitamin D.