Controlling body temperature
      There are a number of factors which need to be considered 
        in maintaining body temperature but they can be split into internal 
        and external factors. 
       
        
          
             
               
                internal factors 
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                external factors 
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              | What we do affects our temperature from something as simple 
                as eating to running on the spot  | 
              The outside environment has an influence on the 
                body's temperature i.e cold or heat.  | 
             
           
        
       
        
      In everyday life we can cope easily with conditions. 
        it is when sportsmen and women push to the extremes that the way they 
        use their bodies and the effect of the environment can affect the safe 
        running of the body. We hear of cases of heat exhaustion and collapsing 
        marathon runners. 
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