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Melanin is the main compound responsible for the color in hair. It is synthesized from the amino acid tyrosine. The absorption of tyrosine is around 280nm, which is a shorter wavelength than humans can see. Tyrosine can not absorb or preferentially scatter visible light in order to appear colored. It appears colorless as it scatters visible light ...


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Human skin is made up of three layers [1]: Epidermis; it contains no blood vessels; it has 5 cellular layers (starting from surface): stratum corneum stratum lucidum stratum granulosum stratum spinosum stratum germinativum Dermis; it is separated from the above by the basal membrane; made up of connective tissue (with blood vessels and nerve endings) ...


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You're confusing an emergent system with a determined system. Your cells have programming which emerges as the form you see. You are using determinism to decide what your form should be. Determinism gives one reaction for every action. Biology is emergent, not deterministic. The biological mechanisms which are responsible for healing exist in a different ...



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