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Le mucus gastrique – Barrière<br />

Gradient de pH<br />

PG2 : production<br />

muqueuse<br />

pH=2<br />

pH=4<br />

pH=7<br />

Suc gastrique dégradation<br />

Couche de mucus<br />

HCO3-<br />

Cellules sécrétant le mucus<br />

HCO3

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