Thrombocytes are essential for coagulation of blood.comment.

Explanation

Blood is a connective tissue.it has many cellular components.Thromobocytes or platelets are one of theme.
Thrombocytes of platelets are found in blood .There number in the blood is 250000 /cubic mL of blood .They are formed in bone marrow and their life span is one week
When an injuiry is caused in the blood vessele,bleeding starts ,and the platelets are disingrated to release the clotting factor 3 called thromboplastin .This in presence of `Ca^(2+)` ions activats prothrombokinase.A series of reaction ultimately occurs which causes blood to clot and plugg the injured blood vessel thus preventing further loss of blood.