F5 1.3 mechanism of blood clotting

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F5 1.3 mechanism of blood clotting

  1. 1. Injury in blood vessels Platelets Platelets clump at the wound Release of thrombokinase Vitamin K Prothrombin Thrombokinase Thrombin Calcium ions Fibrinogen Clot forms to stop further blood loss
  2. 2. Describe the blood clotting mechanism When you get cut, blood vessels around the wound immediately constrict to reduce blood loss. The platelets in the blood exposed to air become sticky and clump together to plug the wound. ___________________& other clotting factors are released by platelets. In the presence of __________ ions, thrombokinase converts prothrombin into thrombin. Prothrombin a plasma protein synthesized in the liver and requires _______________. Thrombin converts soluble plasma protein, _____________ into insoluble _________________ which form a meshwork of threads over the wound. As the blood flows out, erythrocytes & platelets are trapped in the fibrin fibres and a blood clot forms. It dries to form ________ When the wound heals, new skin is formed & the scab peels off.
  3. 3. heredity disease
  4. 4. damaged thrombosis embolus embolism oxygen nutrients heart attack

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