Answer:
Extrinsic pathway:
Extrinsic pathway may be defined as a type of blood clotting pathways in which the multiple protein cascades are initiated by the external factors especially external trauma. This pathway is quite fast and factor VIII is involved in this pathway. Factor IX is activated by the factor VIIa and calcium ions.
Intrinsic pathway:
Intrinsic pathway may be defined as a type of blood clotting pathways in which the multiple protein cascades are initiated by the internal factors especially internal trauma. This pathway is quite slow and factor VIIII, IX, XII and XII is involved in this pathway. Factor IX is activated by the factor IXa and calcium ions.