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GMAT阅读讲义
Caffeine, the stimulant in coffee, has been called“the most widely used psychoactive substance on Earth .”
Synder, Daly and Bruns have recently proposed thatcaffeine affects behavior by countering the activity in(5) the human brain of a naturally occurring chemical calledadenosine. Adenosine normally depresses neuron firingin many areas of the brain.
Caffeine, the stimulant in coffee, has been called“the most widely used psychoactive substance on Earth .”
Synder, Daly and Bruns have recently proposed thatcaffeine affects behavior by countering the activity in(5) the human brain of a naturally occurring chemical calledadenosine. Adenosine normally depresses neuron firingin many areas of the brain.
