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Under normal circumstances, brain death will occur in the absence of oxygen in:
  1. 3-4 minutes
  2. 4-6 minutes
  3. 7-10 minutes
  4. 10-12 minutes
Explanation
Answer: B - On average, it takes the Emergency Medical Services (EMS) 7-10 minutes to arrive at the scene which is particularly problematic as brain death will occur in 4-6 minutes in the absence of oxygen. Under unusual circumstances, such as with immersion in cold water, brain damage can be delayed because of the retardation of cellular processes.
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