Final answer:
Thrombosis is the condition where blood clots due to an abnormality in the coagulation system. Thrombosis occurs when there is excessive clot formation within blood vessels.
Step-by-step explanation:
The condition in which blood clots as a result of an abnormality of the system of coagulation is called thrombosis. Thrombosis occurs when there is an excessive formation of blood clots, also known as thrombi. These clots can form within intact or slightly damaged blood vessels, reducing blood flow or blocking it completely.