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placenta p34

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Fonctions d’échange<br />

• microvillosités<br />

– échanges gazeux : O2 (cytochrome P450), CO2<br />

– échanges nutritifs : glucose, AA, vitamines,<br />

éléctrolytes, fer, oligoéléments, IgG<br />

– épuration : urée, bilirubine libre<br />

• Liquide amniotique<br />

– < 20 SA LA = sérum fœtal<br />

– > 20 SA LA = urine foetale

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