Platelets are primarily involved in which process?

• A. Producing antibodies
• B. Responsible for clotting
• C. Transporting oxygen
• D. Conducting nerve impulses

Answer: (B)

Platelets' primary function is to promote clot formation to stop bleeding. When a blood vessel is injured, platelets quickly adhere to the exposed subendothelial surface and become activated, changing shape and releasing chemical signals that draw more platelets to the site. They clump together to form a platelet plug and provide a surface for the coagulation cascade to generate fibrin, which strengthens and stabilizes the clot. This coordinated action is what stops bleeding.

The other options don’t fit because antibodies are produced by immune cells (not platelets), oxygen is carried by red blood cells, and nerve impulses are conducted by neurons.