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DEHYDRATION, James, a 30-year-old runner is participating 10-kilometre…

- - - - Decrease in blood volume
        
        Decrease venous return, stroke volume and cardiac output
        
        Decrease mean arterial blood pressure
      - Increase in ADH
        
        Increase in tubular permeability
        
        Increase in water reabsorption
        
        Decrease in H20 excretion :
        
        Decrease in urine output
        
        Increase in urine specific gravity
        
        Urine become concentrated
        
        Yellow pigment of urine retained
        
        1 more item...
        
        Dilution of plasma
        
        Hyponatremia
        
        Imbalance of electrocytes
        (Na, Ca, K, Mg)
        
        Reduce blood volume
        
        3 more items...
        
        K+ concentration decreases
        
        1 more item...
        
        Increase reabsorption of urea from collecting ducts
        
        Increase blood urea level
      - Increase in plasma haemotocrit
- - - - Hypoxia
        
        Loss of consciousness
      - Mild headache
- - - - Eyes start to droop and soft