During hemostasis and inflammation, what is the main event?

During hemostasis and inflammation, what is the main event?

• A. White blood cells flow into the injury site
• B. Platelet plug formation
• C. Fibroblast migration to the wound
• D. Collagen deposition at the site

Answer: (A)

In this scenario, stopping bleeding is the first priority after an injury. The main event is platelet plug formation. Platelets quickly adhere to exposed subendothelial collagen (with help from von Willebrand factor), become activated, release granules, and recruit more platelets to form a temporary plug that seals the break. This creates a surface for the coagulation cascade to stabilize the clot with fibrin. Inflammation does follow, with white blood cells migrating to the site to defend and clear debris, but that leukocyte influx is part of the inflammatory response, not the core event that stops bleeding. Fibroblast migration and collagen deposition occur later during the wound-healing phase, contributing to tissue remodeling rather than the immediate hemostatic plug.

In this scenario, stopping bleeding is the first priority after an injury. The main event is platelet plug formation. Platelets quickly adhere to exposed subendothelial collagen (with help from von Willebrand factor), become activated, release granules, and recruit more platelets to form a temporary plug that seals the break. This creates a surface for the coagulation cascade to stabilize the clot with fibrin. Inflammation does follow, with white blood cells migrating to the site to defend and clear debris, but that leukocyte influx is part of the inflammatory response, not the core event that stops bleeding. Fibroblast migration and collagen deposition occur later during the wound-healing phase, contributing to tissue remodeling rather than the immediate hemostatic plug.