National Dental Examining Board of Canada (NDEB) Practice Exam

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Master your National Dental Examining Board of Canada (NDEB) exams with our comprehensive practice guide. Achieve excellence in your dental certification with expertly crafted questions and detailed explanations.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

The central action of caffeine is principally on the...

Heart
Liver
Cerebral cortex
Stomach

The correct answer is: Cerebral cortex

Caffeine is a stimulant that primarily affects the central nervous system, specifically the cerebral cortex. This is because caffeine blocks the action of adenosine, a neurotransmitter that helps us feel tired and relaxed. This increase in neural activity can improve alertness and focus. The other options, such as the heart, liver, and stomach, may also be affected by caffeine, but these effects are secondary and are not the main target of caffeine's action. Additionally, choosing option D, the stomach, as the central action of caffeine may be misleading, as caffeine is often associated with causing stomach discomfort and irritation. Therefore, option C is the most accurate answer as it reflects the primary and most significant effect of caffeine on the body.