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O Levels Biology (5090)•5090/12/M/J/22
Question 27 from 5090/12/M/J/22

Explanation

Alcohol's Short-Term Neurological Effects

Steps:

  • Identify short-term effects as immediate impacts from one episode of heavy drinking, not chronic ones.
  • Recall alcohol acts as a depressant on the central nervous system, affecting brain functions like inhibition.
  • Evaluate choices: Focus on behavioral changes over physical damage or speed alterations.
  • Select the option matching impaired judgment and control from reduced brain activity.

Why C is correct:

  • Alcohol depresses the prefrontal cortex, the brain region responsible for executive function, leading to disinhibition and reduced self-control as defined in neuropharmacology.

Why the others are wrong:

  • A: Heart tissue damage is a long-term effect from chronic alcoholism, not short-term.
  • B: Alcohol slows nerve impulse transmission by enhancing GABA inhibition, not speeding it.
  • D: Alcohol impairs coordination, resulting in longer reaction times, not shorter.

Final answer: C

Topic: Mammalian nervous system

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