Speaking about the main skin general functions, it's impossible not to mention about skin regulation function. So, skin helps regulate body temperature. On the other hand it helps with fluide and electrolyte balance. In the limits of this certain function it is worth mentioning about the property of sweat producing which guarantees evaporation of old bad accumulated elements and cool the whole body down.
The most obvious one is protection from pressure and mechanical or thermal (caused by heat or cold) injuries, environmental, biological (caused by different bacteria) or chemical influences, sun rays or UV-radiation.
As a matter of fact the adding of the fifth sense function to skin general functions seems to be funny or mystical. But everything gets clear if you keep in mind touching as one of the senses besides smell, sight, hearing and taste. If the nightmare comes true and someone looses the skin he or she is likely to lose automatically the feeling of pleasant warm touching, light playful wind or dangerous hot pot. This can easily be explained by the fact that human nervous system is represented by millions of different cells and nerve endings in the skin which ensure making any sense real and possible.
It is very important to realize that if even one of the numerous skin general functions does not work properly or stops working at all the human can die. In the case of skin damage it is impossible to control body water level (it is very important because more than 70% of human body consists of the water) or avoid infection.
As any other organ skin has its own structure with some parts (portions) every of which has its separate functions forming totally skin general functions. Many knows that skin layers are epidermis, dermis and subcutaneous (hypodermic) layer. The epidermis itself is responsible mainly for protecting the human body from harmful sun rays and serious infections as well as controls water rate and prevents its loss. Temperature control is under the power of dermis. It also helps with fluid and electrolyte balance.
By the way there are some factors which are considered to impact skin general functions. The skin condition is affected much by skin dehydrating caused mainly by bad environment. The drying effect can be provided by out of doors factors: wind, sun, UV-radiation. But these reasons are often inevitable. However, there is also a line of household products which are likely to influence human skin in a bad way: different cleaning agents, harsh water itself and bad detergents.
Can we make a conclusion that one of the most important options to be taken into consideration is to take proper care of our skin? Sure, no. All organs are very important. It does not matter if they are big or not, but at the same time we are to remember that all our organs are kept underneath the skin and are protected by this large organ. So it is really necessary to perceive skin as the first-rate immune protective agent. Although it tends to quick renovation it is better to appreciate and look after it from the early beginning not to let the skin loose its main functions.