Functions of the circulatory system (Platelets)

what is hemostasis?

stopping the fatal leakage of blood

What are thrombocytes?

platelets, which are small fragments of megakaryocytes

Whata re the 3 steps of Hemostasis?

vascular spasms

platelet plug

coagulation

what happens during vascular spasms?

smooth walls of the blood vessel contract to try and minimize as much blood loss as possible

What happens during platelet plug?

platelets stick to the injured wall of the blood vessel and to each other to block the injury

What happens during coagulation?

clotting happens, due to fibrinogen converting into fibrin which helps sticks the platelets together

How does fibrinogen convert into fibrin?

with Ca2+ present, factor X combines with factor III and produces the enzyme prothrombin, prothrombin converts into thrombin (plasma protein) and thrombin converts fibrinogen into fibrin

what are tthe two different kinds of ways to coagulation?

intrinsic and extrinsic pathway

what happens during the intrinsic pathway?

uses clotting factors within the blood to clot

what happens during the extrinsic pathway?

initiated by clotting factors that are released by nearby damaged tissues or blood vessels

What is Fibrinolysis?

dissolution of a clot

What dissolves a clot?

plasmin

blank helps prevent inappropriate clotting, and one main one it secretes is heparin.

anticoagulants