Platelet Activation

Platelet activation is the process by which blood platelets, which are small cells in the blood, become activated to form a plug that helps stop bleeding. The process is important for wound healing and a variety of other blood-related processes. Platelets become activated in response to specific signals, including exposure to collagen, thrombin, ADP, and certain other substances. The activated platelets then go on to bind and adhere to each other, as well as to the damaged tissue, forming the plug. Platelet activation is also important in the formation of blood clots, which help prevent excessive bleeding and can be beneficial in the prevention of heart attacks and strokes. In addition, platelet activation is involved in inflammation and immunity, as activated platelets can release chemicals that help to fight off infections and other diseases.