Which component of blood is involved in the formation of blood clots?

• A. White blood cells
• B. Thrombocytes (platelets)
• C. Red blood cells
• D. Plasma proteins

Answer: (B)

Hemostasis and the role of platelets. When a vessel is damaged, platelets (thrombocytes) are the first responders. They quickly stick to exposed collagen, become activated, and release chemicals that recruit more platelets. This creates a platelet plug that temporarily seals the break. The coagulation cascade then strengthens the clot by converting fibrinogen to fibrin, forming a stable mesh. White blood cells and red blood cells aren’t responsible for forming the clot, and while plasma proteins (coagulation factors) are essential for the final stabilization, the initial clot-forming action is driven by platelets.