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羊水

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羊水是水狀液體,包圍襯墊著羊膜內的胚胎。羊水讓胚胎能夠自由活動,不會讓子宮壁壓得太緊。羊水也提供浮力。此外,由於水的比熱容高,羊水能提供胎兒一個恆定溫度的環境,羊水也在生產時潤滑陰道

羊膜在受精兩週後開始成長並且灌水。再過10週後液體包含蛋白質碳水化合物脂質磷脂質、尿素與電解質。到懷孕中期胚胎會在羊水中呼吸,並且發育肺與胃腸道。

羊膜破裂時會有些水流出體外(俗稱為破水)。大部分的水還是留在子宮內直到胎兒出生。

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羊水
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