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WebFeb 11, 2024 · Caffeine is a stimulant. It acts on the central nervous system. Its role as a stimulant is why you feel alert and a boost of energy when you consume caffeine. Although caffeine may be most commonly used for its effect on alertness, it does have other effects on the body. These effects are generally the less desirable ones and act as a reminder ... WebFeb 15, 1999 · During stressful or emergency conditions, they raise the rate and force of the heart, thereby increasing the blood pressure and delivering more oxygen to the brain and other tissues. Caffeine... WebApr 4, 2024 · How Does Caffeine Affect the Body? Caffeine is a stimulant that boosts energy levels and heightens wakefulness. It works by blocking the effects of a sleep-inducing substance in the body called adenosine. Adenosine accumulates in the bloodstream when you’re awake, and then your body clears it away when you sleep. A buildup of adenosine … secret harry potter universal wand