Which chemical is used by blood bank to prevent clotting of blood?

Which blood cells help in the clotting of blood?

Which substance initiate clotting of blood ?

Which vitamin is required for blood clot ?

What is useful to prevent blood clotting in blood vessels? (A) Streptokinase (B) Cyclosporine (C) Statins (D) Hydroxyprojesteron

The component of blood that helps in clotting of blood is :