Normal sleep-wake cycles require which parts of the consciousness system to be functional?
A. Only the basal forebrain, thalamus, and cerebral cortex
B. All brainstem and cerebral components of the consciousness system
C. The consciousness system does not regulate sleep-wake cycles.
D. Only the brainstem components of the consciousness system
ANS: B
Rationale: Consciousness is the awareness of self and surroundings. The consciousness system governs alertness, sleep, and attention. For normal sleep-wake cycles and the ability to direct attention while awake, all brainstem and cerebral components of the consciousness system must be functional.
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