Which chemical is NOT transported in the liquid part of the blood?

Fibrin is a fibrous protein that plays a crucial role in the blood clotting process. When blood vessels are injured, fibrin is formed from its soluble precursor, fibrinogen, through the action of thrombin during the coagulation cascade. Unlike glucose, hormones, and most proteins, which are dissolved in or carried through the liquid part of the blood (plasma), fibrin exists in a solid form as part of the clotting mechanism. In its functional role, fibrin is not freely transported within the plasma but rather forms a mesh that helps to stabilize the blood clot. This distinction highlights why fibrin is not considered part of the transported substances in the liquid component of blood.