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Platelets - Coggle Diagram
Platelets
Characteristics
Not true cells
Anucleate fragments of megakaryocytes
Lifespan
10 days
Main role
Hemostasis and clot formation
Function in Hemostasis
Vascular spasm
Constriction of damaged blood vessel
Platelet plug formation
Platelets adhere to exposed collagen
Become activated and sticky
Aggregate to form a plug
Clotting (Coagulation)
Release clotting factors
Work with fibrin to stabilize the clot
Formation
Origin
Megakaryocytes in red bone marrow
Process
Fragmentation of megakaryocyte cytoplasm
Structure
Membrane-enclosed fragments
Contain
Alpha granules
Clotting factors
Growth factors
Dense granules
ADP
Serotonin
Calcium