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  • Card 8 / 14:
    During what timeframe does a fetus have enough mature structures to breathe on its own if born prematurely? Describe the other structures that develop during this phase.

    At about week 28, enough alveolar precursors have matured so that a baby born prematurely at this time can usually breathe on its own. Other structures that develop about this time are pulmonary capillaries, expanding to create a large surface area for gas exchange. Alveolar ducts and alveolar precursors have also developed.

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Source:  OpenStax, Anatomy & Physiology: energy, maintenance and environmental exchange. OpenStax CNX. Aug 21, 2014 Download for free at https://legacy.cnx.org/content/col11701/1.1
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