Haemostasis.
Haemostasis.
It is defined as the process of stopping of bleeding and involves many steps like following,
Vasoconstriction:
When damage to the blood vessel takes place many chemicals causing vasoconstriction are released which causes vasoconstriction.
The activated platelets start aggregating.
Platelet plug formation:
The platelets which are stuck near the injury site releases chemicals which attract more platelets.
More platelets come and adhere with each other forming a plug which prevents further blood loss.
The formed plug is weak hence to make blockade more powerful blood starts clotting.
Coagulation (blood clotting):
It is a complex process involving many steps.
On damage to blood vessels platelets release “Thromboplastin”.
Thromboplastin activates inactive “Prothrombin” to activate “Thrombin” in plasma.
Thrombin activates inactive “Fibrinogen” to activate “Fibrin”.
The formed fibrin threads intangle with each other to form a mesh.
The blood cells get trapped in the fibrin mesh to form a clot.
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Labels: Human Anatomy and Physiology
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