Observation

 

 

Most of the candidates avoided this question and their performance was poor.

The expected answers are as follow:

(a) (i) Muscle fatigue
     It is accumulation of lactic acid due to reduction of blood supply and exhaustion of nutrients in the muscles.
      (ii) Causes of muscle fatigue
          - reduction of blood supply to the muscles;
          - inadequate supply of nutrients to the muscles;
          - exhaustion of stored food nutrients in the muscle/metabolic fatigue;
          - accumulation of lactic acid;
          - activity engaged-in/exercise;
          - ion imbalance within muscle/glycogen depletion;
          - nervous fatigue and loss of desire.
     (iii) Ways muscles can be toned
          - adequate rest;
          - relaxation and sleep;
          - exercise/explained.

(b) Disadvantages of inadequate rest
          - feeling of fatigue;
          - illness may set-in;
          - tiredness;
          - mental in alertness/memory loss/depression;
          - low input in productivity;
          - high blood pressure;
          - Increased body stress/tension/explained;
          - unpleasant appearance/obesity/explained;
          - low sex drive.