Practice question

How is BAC measured?

  1. By the percentage of alcohol in the bloodstream
  2. By the amount of alcohol in grams of 100 mL of blood or 210 mL of breath
  3. By the volume of alcohol consumed
  4. By the effect of alcohol on bodily functions

Answer: B — By the amount of alcohol in grams of 100 mL of blood or 210 mL of breath

BAC (Blood Alcohol Concentration) is measured by the amount of alcohol in grams per 100 mL of blood or 210 mL of breath. This is because when alcohol is consumed, it is absorbed into the bloodstream and distributed throughout the body. The level of alcohol in the bloodstream is directly related to the amount of alcohol present in a person's breath, thus making it an accurate measure of BAC. Options A and C may seem plausible, but they do not take into consideration the individual's body size and metabolism, which can greatly affect BAC. Option D refers to the effects of alcohol on bodily functions, but does not provide an actual measurement of BAC.

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