In hemostasis, platelets primarily function to

In hemostasis, platelets primarily function to

• A. Regulate blood pressure
• B. To form a hemostatic plug and support coagulation
• C. Carry oxygen
• D. Fight infection

Answer: (B)

Platelets are central to stopping bleeding by forming a temporary plug at the injury site and by supporting the coagulation cascade that stabilizes that plug. When a vessel is damaged, platelets rapidly adhere to exposed subendothelial tissue, become activated, and release signals that recruit more platelets. They stick together to create a platelet plug (primary hemostasis), and they also provide a phospholipid surface that helps coagulation factors assemble, accelerating fibrin formation to stabilize the clot (secondary hemostasis). That’s why the best description is forming a hemostatic plug and supporting coagulation. The other options describe roles of other blood components or systems—regulating blood pressure relates to vascular tone, carrying oxygen is the job of red blood cells, and fighting infection is mainly handled by white blood cells.

Platelets are central to stopping bleeding by forming a temporary plug at the injury site and by supporting the coagulation cascade that stabilizes that plug. When a vessel is damaged, platelets rapidly adhere to exposed subendothelial tissue, become activated, and release signals that recruit more platelets. They stick together to create a platelet plug (primary hemostasis), and they also provide a phospholipid surface that helps coagulation factors assemble, accelerating fibrin formation to stabilize the clot (secondary hemostasis).

That’s why the best description is forming a hemostatic plug and supporting coagulation. The other options describe roles of other blood components or systems—regulating blood pressure relates to vascular tone, carrying oxygen is the job of red blood cells, and fighting infection is mainly handled by white blood cells.