Blood Clotting: Extended (CIE IGCSE Biology: Co-ordinated Sciences (Double Award))

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