Question

What is the difference between fibrinogen (Fibrin) and the platelets?

Answer 1

Fibrinogen (Fibrin) and platelets are both components of blood. These are extremely important in maintaining the blood quality and conduction of metabolic processes of the body and function differently. Also, they are very small in size.

Complete answer
Human blood consists of a component called fibrinogen (a soluble protein) that gets converted into Fibrin (an insoluble protein) at the time of the healing of any wound. Whereas, the platelets (thrombocytes) are one of the three blood cells that are directly involved in blocking the blood flow. Both of these components play a vital role in blood clotting.

Parameters	Fibrinogen	Platelets
Definition	Fibrinogen helps in blood clotting by forming a fibrous web that eventually surrounds the wounded area.	Platelets are the small irregular structures that flow in blood along with other cells. They accumulate around the wounded area to prevent the blood flow thus, ensuring blood clot.
Functions	It is an insoluble glycoprotein that gets converted into fibrin by the action of thrombin.	Thrombocytes are first acted upon by vitamins like Potassium and Calcium that convert it into active thrombin. These thrombins invoke the formation of fibrins.
Occurrence	These are found in the blood plasma, the liquid component of blood.	These are found in the blood itself, as blood cells.
Importance	They help in the transportation of blood platelets to the wounded area.	They help in clotting the wounded area to prevent the blood flow.

Note:
Blood has an anti-clotting protein called Heparin that prevents blood clotting until and unless exposed to air inside the blood vessels. However, thrombocytes are present in an inactive form in the blood and activate only after deactivation of heparin.