What does skin mean?

What does skin mean?

Youthful Skin 

The skin is a flexible outer shell of the animals, especially vertebrates. Other products from animal origin such as shells or skeletons of arthropods are many sources of growth, structure and chemical composition. Skin adjective "skin" (from Latin cutis, skin). In mammals, the skin is the largest organ, the system consists of several layers of tissue, ectoderm, and essential muscles, bones, tendons and internal organs back up. The skin of a different nature, amphibians, reptiles and birds there. All mammals have little hairs on the skin, including marine mammals, hairless. Since the interaction with the environment, the skin is an important role in protection (framework) against pathogens and have lost too much water. Its functions are insulation, temperature regulation, sensation and the protection of vitamin D, folic acid. Greatly damaged skin is trying to improve scarring. This is often discolored and faded. 

Hair means sufficient density of the skin. The skin is used primarily to increase the thermal insulation offers the skin but can also be a secondary sexual characteristic or camouflage his. Some animals, the skin is very hard and thick and can be processed in the skin. Reptiles and fish have hard protective scales of skin protection, and the birds have hard feathers and hard keratin u03B2%. Amphibian skin is no barrier to the adoption of harsh chemicals and are often subject to osmosis. Frog sitting anesthetic solution before going to bed .

Youthful Skin