Which among the following is responsible for the clotting of the blood?

Platelets, or thrombocytes, are the primary actors that initiate clotting. The clotting, or coagulation, process is a complex of steps that revolves around a few fundamental components:

• - Platelets: Platelets are small cell fragments that respond to a bleeding vessel by sticking together to create a temporary platelet plug.
• - Clotting factors: These include proteins such as fibrinogen and prothrombin. Thrombin, which is an enzyme, is used to transform fibrinogen into insoluble fibrin threads that provide clotting support.
• - Vitamin K: Vitamin K is an essential nutrient that allows the liver to produce some of the clotting factors that are required.
• - Calcium ions: These ions act as an essential cofactor.