Final answer:
The processes that prevent loss of blood from circulation when a blood vessel is damaged are called hemostatic mechanisms.
Step-by-step explanation:
The processes that prevent loss of blood from circulation when a blood vessel is damaged are collectively called hemostatic mechanisms. Hemostasis is the body's response to blood vessel damage and involves several steps to stop bleeding and promote clotting. These steps include vascular spasm, platelet plug formation, and coagulation. Through these mechanisms, the body is able to seal off the damaged area and prevent further blood loss.