Plugging a leak in a blood vessel is essential to prevent entry of pathogens and maintain blood circulation. The blood component responsible is platelets, which stick to the damaged site, release clotting factors and form a temporary plug, eventually leading to a stable blood clot that stops bleeding.
CBSE Sample Paper Class 10 Science 2025-26
cbse class 10 science half yearly sample papers
ANSWER: Besides minimising the loss of blood, plugging any leak in a blood vessel is essential to prevent germs and pathogens from entering the body, which could cause infections and diseases. The component of blood responsible for this process is platelets. When a blood vessel is cut, platelets gather at the site of injury, release clotting factors, and help in the formation of fibrin threads. These threads trap blood cells, forming a clot that seals the wound. This prevents excessive bleeding and entry of harmful microorganisms into the bloodstream.