What is the primary function of platelets in hemostasis?

What is the primary function of platelets in hemostasis?

• A. Transport oxygen
• B. To form a hemostatic plug and support coagulation
• C. Produce hormones
• D. Fight infection

Answer: (B)

Platelets are the front-line players in stopping bleeding. Their main role is to form a hemostatic plug at the site of vessel injury and to support the coagulation cascade so the clot becomes stable. When a vessel is damaged, platelets quickly adhere to exposed subendothelial components (helped by von Willebrand factor), become activated, change shape, and release granule contents. This activates and recruits more platelets to build a platelet plug—primary hemostasis. At the same time, platelets provide a phospholipid surface that concentrates coagulation factors, speeding up thrombin generation and the conversion of fibrinogen to fibrin to stabilize the clot. So the key function is forming the initial plug and supporting coagulation to halt bleeding. Transport of oxygen is done by red blood cells, hormones are produced by endocrine systems, and fighting infection is the job of white blood cells.

Platelets are the front-line players in stopping bleeding. Their main role is to form a hemostatic plug at the site of vessel injury and to support the coagulation cascade so the clot becomes stable. When a vessel is damaged, platelets quickly adhere to exposed subendothelial components (helped by von Willebrand factor), become activated, change shape, and release granule contents. This activates and recruits more platelets to build a platelet plug—primary hemostasis. At the same time, platelets provide a phospholipid surface that concentrates coagulation factors, speeding up thrombin generation and the conversion of fibrinogen to fibrin to stabilize the clot. So the key function is forming the initial plug and supporting coagulation to halt bleeding. Transport of oxygen is done by red blood cells, hormones are produced by endocrine systems, and fighting infection is the job of white blood cells.