Q:

The blood brain barrier functions to protect the brain from

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The blood brain barrier functions to protect the brain from


  1. lipid soluble drugs, alcohol and nicotine
  2. fl uctuations in oxygen and carbon dioxide concentrations
  3. neurotransmitters, bacteria and neurotoxins
  4. dehydration and fl uctuating blood glucose level

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C: These substances would alter the function of, or damage the brain. Glucose, oxygen, carbon dioxide, ethyl alcohol and nicotine can cross the BBB easily. 

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