Clotting begins when a __(1)__ occurs in a blood vessel wall. Almost immediately, __(2)__ cling to the blood vessel wall and release __(3)__ , which helps to decrease blood loss by helping to constrict the vessel. __(4)__ released by damaged cells in the area, interacts with __(5)__ on the platelet surfaces and other clotting factors to form __(6)__ . This chemical substance causes __(7)__ to be converted to __(8)__ . Once present, molecule

Question is incomplete, the complete question is as follows :

Clotting begins when a occurs in a blood vessel wall. Almost immediately, cling to the blood vessel wall and release which helps to decrease blood loss by constricting the vessel. is also released by damaged cells in the area. This chemical substance causes to be converted to . Once present, thrombin acts as an enzyme to atatch molecules together to form long, threadlike strands of , which then traps flowing by in the blood.

Clotting begins when a BREAK occurs in a blood vessel wall. Almost immediately, PLATELETS cling to the blood vessel wall and release SEROTONIN, which helps to decrease blood loss by constricting the vessel. THROMBOPLASTIN is also released by damaged cells in the area. This chemical substance causes PROTHROMBIN to be converted to THROMBIN. Once present, thrombin acts as an enzyme to attach FIBRINOGEN molecules together to form long, threadlike strands of FIBRIN, which then traps ERYTHROCYTES flowing by in the blood.

the correct answer is d