Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
The skin is composed of 2 layers: 1. Epidermis – the outermost layers of cells 2. Dermis – below, a thicker layer of tissue containing fat, blood vessels, hair follicles and nerves Epidermis • Outer layers only dead cells and no blood vessels • Keratin hardens the cells, making the surface waterproof • Bottom layers produce new cells and melanin which colours the skin Dermis • Living cells • Contains blood vessels that help regulate body temperature • All tissues are held together by fibres Ridges • Where the dermis and epidermis meet, there is a wave like layer that forms many ridges • These patterns show through the surface of the skin = fingerprints Nails • Hard structures produced by epidermis • These cells lose their cytoplasm which is replaced by keratin making them hard and durable Hair • Hair is a sensory organs with nerve endings in the root • The hair acts as tiny trigger to let the body know something is touching it • Men and women have the some amount of hairs but women have finer hair