1. Vascular Spasm: When a blood vessel is injured, it immediately constricts (vasoconstriction). This reduces blood flow to the area, slowing down blood loss.
2. Platelet Plug Formation: Platelets, tiny cell fragments in the blood, adhere to the exposed collagen fibers in the damaged blood vessel wall. They then release chemicals that attract more platelets, forming a temporary plug at the site of injury. This plug is not very strong but it helps to slow down the bleeding.
3. Coagulation (Blood Clotting): This is the final and most important step in hemostasis. It involves a complex cascade of enzymatic reactions that ultimately lead to the formation of a fibrin mesh. Fibrin is a protein that traps red blood cells, platelets, and other blood components, forming a stable clot that seals the damaged blood vessel and stops the bleeding.
These three steps work together to effectively stop bleeding and prevent further blood loss.
