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Which type of skin is considered the first defense against infection?
Dry skin
Healthy skin
Aged skin
Oily skin
The correct answer is: Healthy skin
Healthy skin is considered the first defense against infection due to its intact barrier function, which is essential for protecting the body from pathogens. This protective barrier consists of the outermost layer of skin, known as the stratum corneum, which helps prevent the entry of harmful microorganisms. Additionally, healthy skin has an appropriate pH level and produces natural oils and sweat that have antimicrobial properties, further enhancing its ability to defend against infections. The skin also plays a role in immune responses through the presence of specialized cells that can recognize and respond to pathogens. While the other skin types may have characteristics that influence their protective functions, such as the potential for increased sebum production in oily skin or a greater likelihood of injury in aged skin, truly healthy skin, with good hydration and integrity, provides the optimal protective barrier necessary for safeguarding against infections.