Final answer:
The extrinsic pathway in blood clotting activates factor X, leading to the common pathway where fibrin is produced to seal off the vessel.
Step-by-step explanation:
The result of the extrinsic pathway in blood clotting is the activation of factor X, which leads to the common pathway where fibrin is produced to seal off the vessel. In the extrinsic pathway, damaged extravascular cells release factor III (thromboplastin) upon contact with blood plasma. Sequentially, calcium ions (Ca²+) and factor VII (proconvertin) are added, forming an enzyme complex that activates factor X and initiates the common pathway.