Integumentary+System+-Parts+and+Functions

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The integumentary system simply means the system for the protection of the body. The system includes skin and hairs and nails on it. The integumentary system is considered as the first barrier that germs have to go through to intrude the body. As the first protector of the body, the main function of the system is to protect the body from outside environments and damages which can be hamful to the inner organisms and structures. Also it can control the body temperature to keep it constant thorugh perspiration while excreting wastes of the body at the same time. Asorbing impacts to protect the body from damages is one of its functions. To improve protections of the body, it has many sensory receptors to sense pressure, temperature, touch, pain to react swiftly to damages before they causes severe problems. Additionally it produces vitamin D with ultraviolet ray from the sun.

The skin, the main parts of the integumetary system, can be divided into three sections: epidermis, dermis, and hypodermis. The epidermis is the outermost part of the system. Under the epidermis is the dermis. The innermost part is hypodermis.

The main function of the epidermis, which is the outermost part of the skin, protects innercells from contamitants and germs. It also has water-proof function. The cell that produces melanin which determines the color of skin is placed in the innermost of the epidermis. The dermis plays lots of roles in the body. First of all, it has sweat glands which produces sweat and excretes wastes from body. Perspiration also makes it possible to adjust the temperature of the body. And the dermis produces elastin fibers and collagen which make skin more resistant to distortion and traction. So the dermis supports the whole skin in the body. Furthermore, many sensory receiptors, which receive informations from outer environment and enable the body to react swiftly to damages, are placed in the dermis. Unlike the epidermis which doesn't have blood vessels, the dermis can get nutritions directly from its blood vessels, and produce energy for the epidermis. The innermost part of skin is the hypodermis. For fatty tissues exists in this layer, the main function of it is to insulate and conserve heat. Also the fatty tissues in it provides extra protection from physical impacts.

The relations of the integumentary system with three other body system First, the integumentary system is directly related to the immune and lyphatic system. Many lymphatic vessels exists in hypodermis and endermis. So when the skin is infected by germs, immune cells from the lymphatic vessels fight back against the germs. Also the skin is the primary defensive system in the immune system. Secondarily, the integumentary system can synthesize vitamin D, and the digestive system can maximize the uptake up calsium with vitamin D. And the hypodermis of the integumentary system preserves fat and glucose the digestive system absorbs. Additionally, many sensroy receiptors which are parts of the nervous system exists in the integumentary system. When something stimulates the any receitors in the skin, the receiptors sense the stimulation and make the body respond to it.


 * [[image:http://upload.wikimedia.org/wikipedia/commons/3/34/Skin.jpg width="283" height="330" caption="File:Skin.jpg" link="http://upload.wikimedia.org/wikipedia/commons/3/34/Skin.jpg"]] ||
 * File:Skin.jpg ||


 * [[image:http://upload.wikimedia.org/wikipedia/commons/thumb/b/b4/Normal_Epidermis_and_Dermis_with_Intradermal_Nevus_10x.JPG/800px-Normal_Epidermis_and_Dermis_with_Intradermal_Nevus_10x.JPG width="253" height="291" caption="File:Normal Epidermis and Dermis with Intradermal Nevus 10x.JPG" link="http://upload.wikimedia.org/wikipedia/commons/b/b4/Normal_Epidermis_and_Dermis_with_Intradermal_Nevus_10x.JPG"]] ||
 * File:Normal Epidermis and Dermis with Intradermal Nevus 10x.JPG ||

The structure of the skin The brief diagram of the layers of the skin



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