Question

College students were given various amounts of alcohol within a specifed timeframe and then asked to drive an obstacle course. The rationale for poor performance in driving as the amount of alcohol intake increased includes, The bloodbrain barrier: Answers A-D interacts negatively with the potassiumsodium pump, allowing alcohol to freely fow into the capillaries of the brain. B allows alcohol, a very lipid-soluble molecule to rapidly enter the brain. C) allows more bilirubin to cross the barrier producing brain damage D excludes water-based compounds from crossing the brain with the exception of alcohol. A

Answer 1

Answer: B (allows alcohol, a very lipid-soluble molecule to rapidly enter the brain).

Alcohol passes between the arteries that is the area of brain and skull region and reach capillaries in order to enter all cells of the brain. It can easily pass through the blood-brain barrier due to it's lipophilic composition. The function of blood brain barrier is to protect brain from foreign particles but certain lipophilic molecules can cross this barriers. Some other particles which can cross this barrier are nicotine, marijuana, heroin etc.