Examlex
What does viability mean,and how likely is a fetus to be viable at 22 weeks? At 26 weeks? Why would this vary depending upon whether a person lives in a developed or a developing country? What is the main obstacle to viability even by the beginning of the third trimester?
N1 Sleep
The initial stage of the sleep cycle, characterized by light sleep and the transition from wakefulness into deeper sleep stages.
N2 Sleep
A stage of sleep characterized by sleep spindles and K-complexes, representing a deeper sleep than N1 and precedes the deep sleep stages.
N3 Sleep
The third stage of non-REM sleep, characterized by deep sleep and the presence of delta waves in the brain.
REM Sleep
A phase of sleep characterized by rapid eye movement, low muscular tone, and the propensity for dreaming, playing a crucial role in learning and memory consolidation.
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