Science Essay

532 Words3 Pages
Lifestyle Chemistry Task 1. Answer the following questions that outline the role of the skin: a) How is the skin used as an organ to separate the body from the external environment? • The epidermis forms a barrier to separate the rest of the body from the external environment. The stratum corneum consists of the dead skin cells that have died from lack of oxygen. These dead cells are firmly attached to one another and are keratinised and they protect the living cells beneath them and help prevent water loss. b) How does the skin assist in body temperature control? • Sweat glands produce a liquid that is released through the pores in the epidermis. When this liquid is released on the surface of the body it evaporates and this in turn cools the body surface. When the body is hot, the rate at which these glands create sweat increases. c) How does the skin act as an organ to protect against entry by disease-causing organisms? • The skin protects us from disease-causing organisms by shedding the top layer of skin and also by producing sweat and perspiration. 2. Define the term 'microflora'. • Microflora are microorganisms that live in connection with our skin. They are able to survive the acidic nature of our skin and sometimes actually help us stop pathogens from entering. The presence of the microflora restricts the resources available for pathogenic bacteria that could survive the acidic environment. The microflora also increase the acidic nature of the skin therefore making it even more unhospitable to many pathogens. 3. Discuss the role of the microflora on skin in different parts of the body. Give examples. • The type of microflora found on the skin varies in other parts of the body. One species of microflora, Corynebacterium acnes, live in the hair follicles, usually without harm to a person. However, when the dead skin from the epidermis
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