Examlex
The rounded opening of the iris through which light enters the eye is called the ________.
Sleep Deprivation
The condition of not having enough sleep, which can impair cognitive function, mood, and physical health.
Serotonin
A chemical messenger vital for regulating mood, digestion, sleep, and various bodily activities.
Suprachiasmatic Nucleus
A tiny region in the brain's hypothalamus responsible for controlling circadian rhythms, functioning as the body's internal clock.
Sleep Cycles
The progression through various stages of sleep, including REM and non-REM phases, which repeat approximately every 90 minutes.
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