Final answer:
Hemostasis is the sequence of responses that stops bleeding when blood vessels are injured. It involves vascular spasm, formation of a platelet plug, and coagulation.
Step-by-step explanation:
The sequence of responses that stops bleeding when blood vessels are injured is known as hemostasis. Hemostasis involves three main steps: vascular spasm, formation of a platelet plug, and coagulation. Vascular spasm is the constriction of blood vessels to reduce blood flow, while the formation of a platelet plug involves platelets sticking together at the site of injury. Finally, coagulation is the process of blood clotting, where a fibrin mesh is formed to seal off the damaged blood vessels and prevent further blood loss.