Assertion: caffeine | /r/CapableOf | act as central nervous system
Facets:
value: in humans
type: OTHER
Source sentences:
text: In humans, caffeine acts as a central nervous system (CNS) stimulant, temporarily warding off drowsiness and restoring alertness.
text: Caffeine acts on the central nervous system, speeding up the heartbeat and rate of breathing, dilating blood vessels and relaxing smooth muscles.