Ohio Top Driver Practice Test 2025 – Complete Exam Prep

Stimulants are a class of drugs that enhance the activity of the central nervous system (CNS). They increase alertness, attention, and energy levels by raising the levels of certain neurotransmitters in the brain. Common examples include caffeine, nicotine, and certain prescription medications like those used to treat ADHD.

The reason stimulants are identified as speeding up the CNS is due to their physiological effects on the body. They can increase heart rate, boost blood pressure, and elevate mood, making individuals feel more awake and focused. This contrasting effect with other drug categories emphasizes the unique role stimulants play in influencing mental and physical performance.

In contrast, depressants do the opposite by slowing down brain function and the CNS, resulting in sedation or relaxation. Hallucinogens primarily alter perception and can lead to changes in mood and consciousness without necessarily affecting the speed of CNS activity in a straightforward manner. Narcotics primarily serve to relieve pain and induce sleepiness, generally leading to a decrease in CNS activity. This distinction clarifies why stimulants are the correct choice for boosting central nervous system activity.