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Various Anatomy Points

1) The most superficial layer of skin, made of keratinocytes, is dead and provides a protective barrier. If the keratinocytes were a live at the surface, how could that compromise the protective function of the integument?

2) Electrolysis is the process of hair removal by using electric current. Explain how this might destroy the process of hair growth in reaction to the hair bulb?

3) Since hair color is determined by pigment in the coxtex and the hair shaft is dead, explain the fallacy of a person's hair turning white overnight?

4) Tattoos consist of ink injected into skin. do you think that the ink is injected into the epidermis or the dermis? what support do you give for your answer?

5) A subcutaneous injection is inserted in hypodermal or subcutaneous layer, based on structures found in the hypodermis and not in the epidermis, why is this a preferred area for administering an injection?

Solution Preview

1) Living cells require a blood supply for nutrient and gas exchange. Proving capillary supply to the surface of the skin would mean that entry of pathogens into the porous capillaries from the surface would be easier. Additionally, waterproofing of living cells is not possible given that it would prevent gas exchange, so skin could not be water proof if the toper layer were alive. Finally, if capillaries were near the surface of the skin, without any protective layer of cells, heat loss would be magnified and thermoregulation would become more difficult.

2) Current supplied by electrolysis creates heat, particularly at the root (papilla) of the hair. This ...

Solution Summary

Various anatomy points are discussed.Superficial layers of skin, and the process of hair removal by electric current is examined.