The component of blood that helps in coagulation is called "platelets" (thrombocytes). Platelets are small, disc-shaped cell fragments that are essential for the blood clotting process. When a blood vessel is injured, platelets aggregate at the site of the injury and release substances that promote clot formation. They help to seal wounds and prevent excessive bleeding, working in conjunction with clotting factors and fibrin to form a stable clot. This process is vital for healing injuries and maintaining hemostasis, ensuring that blood loss does not occur from broken vessels due to cuts or internal damage.