Human skin is the largest organ of human body and plays a vital role to maintain normal physical function. It protects us from harmful materials in the environment, such as UV (ultraviolet light) and microorganism. It also helps us preserve water within our body rather than being dehydrated. Most important of all, it determines how youthful we look like.
Originated from ectoderm of embryo, multiple growth factors are needed and meticulously work together to initiate genesis of our skin. These growth factors could also help skin turn over and regenerate from stem cells within basal layer of epidermis, hair follicles and fat tissue. However, the amount of growth factors and ability of generating new skin tissue decrease with age. The synthesis of collagen and elastic fiber slows down gradually after aged 25. Therefore, we notice the appearance of wrinkles and loss of elasticity of our face as we grow old.
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