Define coagulation.

Coagulation is the process by which blood forms clots to stop bleeding. It involves a series of complex reactions that result in the formation of a fibrin clot, which helps to seal off a wound and prevent further blood loss.

Coagulation is a physiological process that involves the conversion of a liquid into a semi-solid or solid state. It refers to the formation of a clot or coagulum, typically composed of a network of proteins, in response to tissue injury or exposure to foreign substances.

In the context of blood clotting, it is the process by which blood changes from a liquid to a gel-like consistency, forming a blood clot. It involves a complex series of biochemical reactions, known as the coagulation cascade, that result in the conversion of a soluble protein called fibrinogen into insoluble fibrin strands, creating a mesh that traps blood cells and plasma, forming a clot.