Which of the following statements is true of the physiological effects of caffeine?
A. Lower dose levels of caffeine affect the autonomic centers of the brain, and heart rate and respiration can increase at this dose.
B. With two cups of coffee taken close together (about 200 mg of caffeine), the cortex is deactivated, the electroencephalography (EEG) shows a calming pattern.
C. The pharmacological effects on the central nervous system (CNS) and the skeletal muscles are probably the basis for the wide use of caffeine-containing beverages.
D. In the absence of tolerance, even 200 mg of caffeine will decrease the time it takes to fall asleep and will cause hypersomnia.
Answer: C
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