18 Questions
What is the typical lifespan of a platelet once it is released into the peripheral blood?
9-11 days
Which part of the platelet surrounds the granular chromomere and appears clear to light blue in color?
Hyalomere
Where do approximately 30% of circulating platelets get trapped, reducing their circulation to 70%?
Spleen
Which structure of the platelet membrane is likely derived from the plasma membrane of the megakaryocyte?
Glycocalyx
Which part of the platelet is granular and located centrally?
Chromomere
What is the color appearance of the hyalomere in a platelet?
Clear to light blue
What is the main function of the glycoproteins incorporated in the outer layer of the platelet membrane?
Promote platelet adhesion and aggregation
Which substance present in platelet electron dense granules helps in contracting blood vessels?
Serotonin
What is the main role of thrombosthenin in the platelet membrane?
Maintain platelet shape
Which component of platelet cytoplasm is responsible for fatty acid metabolism?
Mitochondria
Which types of granules found in platelets are rich in Ca++ and Mg++ ions?
Electron dense granules
Which statement accurately describes the role of lysosomes in platelets?
Carry digestive enzymes for phagocytosis
What happens to the cytoplasmic basophilia of a mature megakaryocyte?
It fades and becomes filled with reddish-purple granules
How are platelets produced from megakaryocytes?
By detaching pseudopods into specialized blood vessels
What stimulates platelet production?
Thrombopoietin
What happens to a megakaryocyte's nucleus when its cytoplasm is broken away for platelet production?
It undergoes degeneration and is eventually taken by macrophages
What happens to a nucleus without cytoplasm in the bone marrow?
It undergoes degeneration and is taken by macrophages
How does the size of a megakaryocyte's cytoplasmic mass affect platelet production?
The larger the cytoplasmic mass, the more platelets are produced
Test your knowledge on the structure of the platelet membrane, including its smooth surface, glycocalyx, glycoproteins, and communication channels. Learn about the roles of glycoproteins in platelet adhesion, aggregation, and interaction with coagulation factors.
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