Which of the following statements about alcohol in the human body is true?

The correct statement is that a small amount of alcohol can adversely affect judgment. Alcohol is a psychoactive substance that, even in small quantities, can impair cognitive functions, including decision-making and judgment. This is due to its effects on the central nervous system, where it can disrupt the normal processing of information and lead to reduced inhibition and poor decision-making skills.

Understanding this is particularly important in contexts such as airport operations, where impaired judgment can have serious consequences for safety and efficiency. It’s crucial to recognize that alcohol does not need to be consumed in large quantities to have these negative effects; even minor levels can cause a decline in cognitive performance and an increase in the likelihood of mistakes.

The other statements about alcohol are misleading in various ways. While some might assume that alcohol enhances decision-making or that only large amounts are harmful, research indicates that even minimal consumption can lead to reduced cognitive abilities. The claim that alcohol has no effect at altitude ignores the fact that physiological changes at high altitudes can exacerbate the effects of alcohol, potentially leading to further impairment.