we can say that blood clotting is a function of blood because plasma is involved in blood cloting and plasma is a consituent of blood.
platelets
Fibrinogen and platelets (Thrombocytes). The vitamin required for this to work properly is vitamin K.
Platelets are the components in the blood that helps clotting. Whenever you get a cut or bruise that starts to bleed, the platelets in your body help clot the cut so that the body does not lose alot...
thrombocytes I don't know about the above answer, but I do know platelets help with blood clotting.