Question

Alcohol affects mental and motor functions because

• A. It causes degeneration of contractile fibers of muscles.
• B. It crosses blood-brain barrier.
• C. It is quickly absorbed in gut.
• D. It raises blood pressure.

Answer 1

The correct option is B It crosses blood-brain barrier.

Alcohol is circulated throughout the body as it enters the bloodstream. It affects the brain ability to control body behaviour and functions because it impairs the blood-brain barrier. It can cross the barrier between blood and brain and enter the blood cells from the blood circulating in brain thus, killing the brain cells.

So, the correct answer is 'It crosses blood-brain barrier'.