Thrombocytes (blood platelets)

Platelets in a Giemsa-stained blood film

Thrombocytes or blood platelets are small pieces of platelet cells. They are the smallest blood cells, averaging 2-4 microns in diameter. Their main role is to repair tears in blood vessels. While these tiny particles conduct a very important role in the human body, thrombocytes survive for only a few weeks before macrophages remove them from circulation.

Photo Credit: 
Dr Graham Beards on Wikimedia Commons