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When taken in small to moderate doses, caffeine has been shown to improve alertness, attention, and performance on simple motor tasks.
Nervous System
The nervous system is the network of nerve cells and fibers that transmits nerve impulses between parts of the body, coordinating bodily functions and responding to internal and external stimuli.
Stimulation
The action of applying a stimulus to a bodily part to produce a response, often used in a variety of contexts from physical to mental stimulation.
Vasoconstriction
The narrowing of blood vessels, which increases blood pressure and decreases blood flow to certain parts of the body.
Smooth Muscle
Muscle tissue that forms organs like the stomach and bladder, characterized by its lack of striations and its ability to contract involuntarily.
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