Blood Clotting (Cambridge (CIE) IGCSE Co-ordinated Sciences (Double Award)): Revision Note

Blood Clotting: Extended

Extended Tier Only

• Platelets are fragments of cells which are involved in blood clotting and forming scabs where the skin has been cut or punctured

• Blood clotting prevents continued / significant blood loss from wounds

• Scab formation seals the wound with an insoluble patch that prevents entry of microorganisms that could cause infection

• It remains in place until new skin has grown underneath it, sealing the skin again