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When a blood vessel is injured, the damaged cells in the vessel wall send out chemical signals. These signals cause clots that slow or stop bleeding. If you have a high platelet count, blood clots may form in your blood vessels even when there is no injury. These clots can block blood flow through your body and prevent your organs from getting enough blood. If you have a low platelet count, your blood may not clot normally and you may have trouble stopping bleeding. This can make you lose a lot of blood even from a small injury. Bleeding disorders and blood clotting disorders also affect how blood clots form in your body. Learn more about blood clots, what causes them, and how they can affect your health in this NIH article.
When there is an injury that causes bleeding, the nearby blood vessels narrow to help prevent blood loss. Platelets arrive and plug the leak. The platelets also create a reaction with clotting factors to form a fibrin clot. Medical Animation Copyright © Nucleus Medical Media, All rights reserved. (责任编辑：) |