A platelet (thrombocyte) is a tiny cell fragment that helps stop bleeding by forming blood clots.
Platelets are produced in the bone marrow from large cells called megakaryocytes. When a blood vessel is injured, platelets quickly gather at the site, stick to one another, and release chemicals that help form a stable clot. They work closely with clotting proteins to prevent excessive blood loss while allowing damaged blood vessels to heal.
Too few platelets can increase the risk of bleeding, while too many may contribute to abnormal clot formation.
QUICK FACT
Platelets are cell fragments, not complete cells.
COMMONLY CONFUSED WITH
- Clotting factor: a protein involved in the biochemical process of blood coagulation.
- Red blood cell: primarily transports oxygen.
- White blood cell: primarily involved in immune defense.
SEE ALSO
