Which of the following statements regarding the clotting of blood in humans are correct ?
- Heparin, produced by liver prevents blood from clotting inside the body.
- Vitamin K helps in blood clotting.
- Chelating Agents such as Sodium/Potassium Oxalate are used in blood banks to prevent clotting.
- Thalassemia is the condition where human blood takes abnormally long time to clot.