Which substance is considered a stimulant?

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Multiple Choice

Which substance is considered a stimulant?

Explanation:
Stimulants are substances that increase activity in the brain and nervous system, boosting alertness, energy, and wakefulness. Caffeine does this by blocking adenosine receptors, which normally promote sleepiness, so you feel more awake and attentive. It can also cause a slight uptick in heart rate and blood pressure, reinforcing its stimulant effects. Alcohol, heroin, and cannabis do not fit this category: alcohol is a depressant that slows brain function, heroin is an opioid with sedating effects, and cannabis is not classified as a stimulant and typically has relaxing or perceptual-altering effects.

Stimulants are substances that increase activity in the brain and nervous system, boosting alertness, energy, and wakefulness. Caffeine does this by blocking adenosine receptors, which normally promote sleepiness, so you feel more awake and attentive. It can also cause a slight uptick in heart rate and blood pressure, reinforcing its stimulant effects. Alcohol, heroin, and cannabis do not fit this category: alcohol is a depressant that slows brain function, heroin is an opioid with sedating effects, and cannabis is not classified as a stimulant and typically has relaxing or perceptual-altering effects.

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