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What Does Viability Mean,and How Likely Is a Fetus to Be

question 25

Essay

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?


Definitions:

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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