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基礎(chǔ)醫(yī)學(xué)

        Epithelialtissuesarecomposedofcloselyaggregatedpolyhedralcellswithverylittleextracellularsubstance.Animportantfeatureofepitheliaistheirpolarity:theyhaveafreesurfaceandabasalsurfacethatrestonthebasalmembrane.Sincebloodvesselsdonotnormallypenetrateanepithel    (共 1229 字)     [閱讀本文] >>

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