Blood Platelet

The body's tiny emergency repair crew/Medicine & Biology

Platelets are the smallest cells in your blood at just 2-3 micrometers in diameter. They are disc-shaped fragments released by megakaryocytes in bone marrow, and your blood contains about 150,000 to 400,000 per microliter. When you get a cut, platelets rush to the site and stick together to form a plug, initiating the clotting cascade that stops bleeding.