Cite body tries to maintain body temperature by vasoconstriction and shivering. Shivering is the body main involuntary defense against the cold prod icing body heat by forcing muscles to contract and relax rapidly. Sophistication’s is the tightening Of blood vessels L] Vasoconstriction occurs in the uncovered skin when it is exposed to cold temperatures. C] The reduced blood flow in the skin conserves body heat but can lead to discomfort, numbness, loss of dexterity in the hands and fingers. How The Body Produces Heat
Normal body temperature is maintained by a balance of heat production and heat loss Ahead is produced by food metabolism and muscle activity. Shivering increases heat production up to 500% C] lack of food limits the body ability to produce heat. Heat Loss From The Body Cowboy heat can be lost by four mechanisms. 1 . Convection is the loss of heat from the body by air blowing over the skin or through clothing. 2. Conduction, or direct contact with a colder object. For example, lying in snow but with the exception of being immersed in cold water; Heat is then lost 25 o 30 times faster. . Evaporation, or conversion of liquid on the skin to vapor. This accounts to 20% of heat loss through sweating and respiration. 4. Radiation is the primary method of heat loss, accounting for about 65% of the body heat loss. Freezing Cold Injuries Occur whenever the air temperature is below freezing. 0 Frosting – caused when water on the skin surface freezes CLC It is the first sign of impending Frostbite – happens only in below- freezing temperatures. Frostbite. C] Tissue is damaged in Non ways 2. Actual tissue freezing.
The obstruction of blood supply to the tissue Recon zing Frosting Frostbite C] Skin appears red and sometimes swollen C] Painful but usually no further damage after rearming C] Repeated frosting in the same spot can dry the skin, causing it to crack. L] The skin is white, waxy, or grayish yellow. C] The affected area feels very cold and numb; stinging or aching sensation. The skin surface feels stiff or crusty. Care For a… Frosting Victim Frostbite Victim Gently warm the affected area by placing it against a warm body part. DO NOT rub the affected area .
Get the victim out of the cold and to a warm place. Remove any wet clothing or constricting items. Seek immediate medical care. Examples DO NOT Allow the victim to exert himself or herself. Cup an unconscious victim in a bathtub C]Give the victim alcohol. Alcohol interferes with shivering and accelerates the heat loss process. Cirrus or massage the victim’s arms or legs. L]Raise the victim’s legs. This allows cold blood from the legs to flow into the body core and heart. Always keep victim in a flat position.