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Thinking Scientifically
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  1. It is observed that some motor neurons innervate only a few muscle fibers in the biceps brachii. Other motor neurons each innervate many muscle fibers. How might this observation correlate with our ability to pick up a pencil or a two-liter soda bottle? On what basis would the brain bring about the correct level of contraction?
  2. Some athletes believe that if they take oral creatine it will increase their endurance because it will increase the amount of phosphate available to their muscles for ATP synthesis. This statement can be regarded as two hypotheses: 1) oral creatine will increase endurance; 2) oral creatine increases the amount of creatine available in muscles for ATP synthesis. How could these two hypotheses be tested?

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