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This answer is a reply to the question asked in the comment of my answer given on 13th July 2016. The comment was, " Nice answer, I gather that bacteria would enter more easily, what about viruses?" In my answer on 13th July 2016, I used the term "microorganisms" - this includes both bacteria and viruses. So the answer provided there can also be applied to ...


Our epidermis is the first line defence against natural infections; it is also a part of the innate immune system. This is due to it contains a layer of dead cells that separates the living cells of the deeper layers of epidermis and dermis from the environment. This part of the epidermis is avascular and so pathogens can not easily enter into the ...


The dermis provides some protection, and if it is removed the danger of deep tissue infection becomes extremely high. However, the epidermis provides an additional and important layer of antimicrobial protection. That is why first and second degree burns, opened blisters, and scrapes should be kept clean and isolated from the environment with bandages, and ...


Think of what happens when you don't wash your hair for days. It gets oily and greasy. This oil-like substance on your hair is called sebum and mainly works as a lubricant . The Sebaceous glands responsible for excreting sebum don't stop working when the hair follicles attached to them do. The result is a "shiny" head.

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