Examlex
The head of a sperm consists of the acrosome and the ________, but little else.
Narcolepsy
A disorder involving sudden and unpredictable daytime attacks of sleepiness or lapses into REM sleep.
Sleepiness
Sleepiness is the state of feeling drowsy or tired, often leading to a decreased ability to remain awake and alert.
Unpredictable
The quality of being unable to be predicted or foreseen, often leading to uncertainty or surprise.
Suprachiasmatic Nucleus
A region in the brain's hypothalamus responsible for controlling circadian rhythms, which are the body's internal biological clock.
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