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1. Muscle fatigue is caused by ________.
 
 
 
 

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2. A sprinter would experience muscle fatigue sooner than a marathon runner due to ________.
 
 
 
 

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3. What aspect of creatine phosphate allows it to supply energy to muscles?
 
 
 
 

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4. Drug X blocks ATP regeneration from ADP and phosphate. How will muscle cells respond to this drug?
 
 
 
 

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5. Critical Thinking: Why do muscle cells use creatine phosphate instead of glycolysis to supply ATP for the first few seconds of muscle contraction?

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6. Critical Thinking: Is aerobic respiration more or less efficient than glycolysis? Explain your answer.

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