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🩸 White Blood Cells (WBC) - Coggle Diagram
🩸 White Blood Cells (WBC)
🩸 Platelets
Main Function
Help blood clot
Prevent excessive bleeding
Repair damaged blood vessels
Maintain hemostasis
Formation
Produced in red bone marrow
Derived from megakaryocytes
Released into the bloodstream
Characteristics
Smallest formed elements in blood
Do not have a nucleus
Lifespan of about 7–10 days
Circulate in the blood
Structure
Cell fragments
Surrounded by a plasma membrane
Contain granules with clotting substances
Disc-shaped when inactive
Functions
Form a platelet plug
Release clotting chemicals
Stop bleeding
Promote vessel repair
Help wound healing
Blood Clotting Process
Blood vessel is injured
Platelets stick to the damaged area
Platelets clump together
Clotting factors are activated
A stable clot forms and bleeding stops
Characteristics
Have a nucleus
Larger than red blood cells
Colorless cells
Can move through blood vessel walls
Produced in bone marrow
Structure
Contain a nucleus
Have cytoplasm
Variable shape
Some contain granules
Classification
Granulocytes
Neutrophils
Eosinophils
Basophils
Agranulocytes
Lymphocytes
Monocytes
Main Function
Protect the body from infections
Fight bacteria, viruses, fungi, and parasites
Participate in immune responses
Remove damaged cells
Types and Functions
Neutrophils
Most abundant WBC
First cells to respond to infection
Destroy bacteria by phagocytosis
Eosinophils
Fight parasites
Help during allergic reactions
Control inflammation
Basophils
Release histamine
Trigger allergic responses
Promote inflammation
Lymphocytes
B cells produce antibodies
T cells attack infected cells
Provide immune memory
Monocytes
Largest leukocytes
Become macrophages in tissues
Remove pathogens and dead cells