Blood Alcohol Concentration (BAC) Practice Exam

Which factor do not affect BAC?

Hair color Time since last drink Body weight Amount of alcohol consumed

Correct Answer:

Hair color

Explanation:

The main idea here is that BAC is determined by how much alcohol enters the bloodstream and how quickly the body processes it. Hair color doesn’t influence any of those processes, so it doesn’t affect BAC. Alcohol amount consumed directly raises BAC because more ethanol enters the bloodstream. Time since the last drink matters because the liver metabolizes alcohol at a fairly steady rate, so BAC declines as time passes. Body weight matters because alcohol distributes in body water; a person with more body water will typically have a lower BAC from the same amount of alcohol than someone with less body water. Since hair color has no relation to body water, metabolism, or absorption, it doesn’t affect BAC.

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