A volleyball player depends on the gastrocnemius muscles for plantar flexion, whereas a marathon runner depends more on the soleus muscles for the same action. What characteristic of the soleus muscles makes this so?
A. They don't have as many blood capillaries per gram of tissue.
B. They break ATP down to ADP and Pi faster.
C. They make more use of aerobic respiration.
D. They have smaller mitochondria.
E. They have more glycogen in them.
Answer: C
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