Most pathogens cannot invade the skin unless there is a wound or opening because of the tough waterproof keratin in the skin is true statement.
Vertebrates have skin, which is a soft outer tissue. It is the biggest organ in humans, with a total surface area of around 20 square feet. It uses a multi-layered system of cushioning, a cellular barrier, and protective oils to shield our internal organs from the environment.
Skin serves as more than simply a barrier between our internal organs and the outside world; it also actively contributes to preserving our health by regulating body temperature, such as through sweating and flushing in hot weather and causing goosebumps in cold weather. It may also generate Vitamin D from sunshine, which is crucial for the well-being of our bones.
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