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==Actions==
==Actions==
<p>Thrombocytes play a number of roles in [[Platelet Responses|haemostasis]]. They adhere to exposed connective tissue in the walls of blood vessels forming platelet plugs, while releasing a number of factors from their granules. The glycocalyx on their surface provides a surface for fibrinogen to convert to fibrin leading to the formation of the secondary haemostatic plug. The platelets then contract (see structural zone) reducing the clot size. Finally lytic enzymes are released to break the clot down.</p><p>If platelet numbers fall below 50x10<sup>9</sup>/l an animal is likely to haemorrhage after trauma and if the count falls below 30x10<sup>9</sup>/l then spontaneous haemorrhage is a risk.</p><p>PDGF from the granules stimulates tissue repair in blood vessels by stimulating smooth muscle cell growth and division and by stimulating fibroblast activity.</p>
<p>Thrombocytes play a number of roles in [[Normal mechanisms of Heamostatic Control|haemostasis]]. They adhere to exposed connective tissue in the walls of blood vessels forming platelet plugs, while releasing a number of factors from their granules. The glycocalyx on their surface provides a surface for fibrinogen to convert to fibrin leading to the formation of the secondary haemostatic plug. The platelets then contract (see structural zone) reducing the clot size. Finally lytic enzymes are released to break the clot down.</p><p>If platelet numbers fall below 50x10<sup>9</sup>/l an animal is likely to haemorrhage after trauma and if the count falls below 30x10<sup>9</sup>/l then spontaneous haemorrhage is a risk.</p><p>PDGF from the granules stimulates tissue repair in blood vessels by stimulating smooth muscle cell growth and division and by stimulating fibroblast activity.</p>
===Pathology===
===Pathology===
[[Category:Blood_Cells]]
[[Category:Blood_Cells]]