Intrinsic tenase complex contains the active factor IX (IXa), its cofactor factor VIII (VIIIa), the substrate (factor X), and they are activated by negatively charged surfaces (such as glass, active platelet membrane, sometimes cell membrane of monocytes).
O complexo tenase intrínseco contén o factor IX activo (IXa), o seu cofactor factor VIII (VIIIa), o substrato (factor X), os cales son activados por superficies cargadas negativamente (como vidro, membranas de plaquetas activas, e ás veces membranas de monocitos).