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The knowledge of wounds

The structure, function and wound healing of skin are introduced
Structure Of The Normal Skin
The skin has three layers from the outside to the inside: epidermis lager, dermislayer and subcutaneous layer.
The Skin is The Largest Organ of The Human Body With The Following Functions:
1. Protoctive and dofensive functions:
*Skin provides protection against physical injury.
*The weak acid environment on the skin surface (PH4.2-5.6) has the function of resisting microorganisms.
*Skin has certain resistonce to the invasion of chemical substances.
2.Metabolic function:
Skin participates in the metabolism of sugar. water, protein,lipids and other substances through the secretion and absorption of sweat glonds and sebaceousglands. Maintain the balance of body fluids, proteins and electrolytes.
3.Body tomperature regulation function:
Skin relies on its rich vasoganglion and swoat glands to participate in bodytemperature regulation, so as to maintain a constant body tomperature.
4.Respiratory function:
Skin excretes carbonic acid and absorbs oxygen. Under normal circumstances, itaccounts for about 1% of lung airmetobolism and 15-20% of lung metobolismunder high temperature or strong activitios.
5.Sensory function:
The skin is rich in nerve endings, which can sense pain, touch, heat, cold , etc.
The Healing Process And Clinical Stages And Characteristics Of Wounds
Wounds are the damage of normal skin tissue caused by external traumatogenic factors such as surgery, external force, heat electricity, chemical substances, low temperature, and organism internal factors such as local blood supply disorder. It is often accompanied by destruction of skin integrity and loss of a certain amount of normal tissues, as well as impaired normal skin function.


Local Factors Affecting Wound Healing
1.lnappropriate local treatment of wounds: due to the lack of basic knowledge of the wound and improper use of various dressings.
2.Humidity of wounds: colls, enzymes and growth factors on wounds do not function under dry conditions. When in a humid environment, its activity is enhanced, thuspromoting wound healing.
3.Tomperature of wounds: the activity of various cells and enzymes on wounds is the highest at normal body temperature.The research shows that if the temperature of wound surface is lower than body temperature more than 2°C, the activity of cells and enzymes decreases greatly.
4. Inadequate local blood supply to wounds: the increase of local pressure, friction, and shear force of local wound or inflammation of local small blood vessels leadsto thrombosis, which is the decrease of blood supply in the local wound, thusaffecting wound healing.
5.Infection of wounds: the infection of wounds can cause necrosis of local tissue cells and hinder wound healing.
6.Scab formation on the wounds: the formation of scab can affect the normal metabolism of wound and the migration of epithelial cells.
7.Pain of wounds: the pain of wounds will shrink the blood vessels around the wound,reduce the oxygen supply of the tissue, and affect the reconstruction of the vascular tissue.