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DHanzel DHanzel
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12 years ago
Kyla is studying seal diving and noticed that the heart rate of a seal dips to a few beats per minute during a dive. Why?
   A. Aerobic cellular respiration ceases during a dive.    
   B. An active heart is required only during air breathing.    
   C. A large share of the blood oxygen supply is diverted to limb muscles.    
   D. A heart is required underwater only for gills as there is no air to breathe.    
   E. Muscles contain considerable myoglobin and don’t need oxygen.
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