calcium
Calcitonin "tones down" plasma calcium concentrations (as Ca++). If calcitonin were high, Ca++ would be low, and calcium ion is an important cofactor in the clotting process.
This type of enzyme is called a cofactor, where the protein part is the enzyme and the vitamin is the cofactor. In this specific example, the vitamin likely acts as a cofactor by assisting the enzyme in catalyzing the blood clotting reaction. Cofactors are essential for the proper functioning of many enzymes in the body.
Platelets are important for blood clotting. Along with these platelets there are various blood clotting factors which helps to clot the blood.
There are lots of clotting factors, vitamin K, calcium ion, and platelets.
Platelets help with blood clotting
The chief plasma component to the clotting of blood is the platelet. The additional components include blood clotting factors.
A cofactor refers to a macromolecule that attaches to an enzyme to assist in catalysis. This can be a metal ion or a coenzyme.
Red blood cells do not initiate clotting. Platelets initiate clotting.
Hemophilia
Plasma is the liquid component of blood. It does not cause the clotting. The part of blood that causes clotting are the platelets.
Vitamin K is responsible for blood clotting. Or is it responsible for clotting blood? Whatever way you want to say it, it's vitamin K. :)
Hemophilia is a genetic blood clotting disorder.