Prab: CSV import

2025-03-17T23:33:37Z

CSV import

← Older revision		Revision as of 23:33, 17 March 2025
Line 32:		Line 32:
	{{stub}}		{{stub}}
	{{No image}}		{{No image}}
			__NOINDEX__

Prab: CSV import

2025-02-11T04:59:15Z

CSV import

← Older revision		Revision as of 04:59, 11 February 2025
Line 31:		Line 31:

	{{stub}}		{{stub}}
			{{No image}}

Prab: CSV import

2024-02-25T17:02:02Z

CSV import

New page

'''Platelet Plug'''

A '''[[Platelet plug]]''' or '''[[Platelet thrombus]]''' is a gathering of [[platelets]] in the blood. It forms at the site of a damaged blood vessel to prevent bleeding. It is the first step in the process of [[hemostasis]], which is the cessation of blood loss from a damaged vessel.

== Formation ==

The formation of a platelet plug, also known as '''[[primary hemostasis]]''', begins when platelets adhere to the subendothelial collagen at the site of an injury. This adhesion is mediated by a glycoprotein in the platelet membrane, '''[[Glycoprotein Ib]]''', which binds to '''[[von Willebrand factor]]''' (vWF) that has been bound to the exposed collagen.

Once adhered, the platelets change shape from spherical to stellate, and release the contents of their granules. This process is known as '''[[platelet activation]]'''. The granules contain substances such as '''[[ADP]]''', '''[[thromboxane A2]]''', and '''[[serotonin]]''', which promote further platelet activation and recruitment.

The recruited platelets then aggregate, forming a platelet plug. This aggregation is mediated by '''[[fibrinogen]]''' and the platelet membrane glycoprotein '''[[Glycoprotein IIb/IIIa]]'''. The fibrinogen forms bridges between the glycoprotein IIb/IIIa receptors of different platelets, effectively sticking them together.

== Role in Hemostasis ==

The platelet plug serves to temporarily block the site of injury and prevent further blood loss. However, it is not stable and can easily be dislodged. To stabilize the plug, the process of '''[[coagulation]]''' or secondary hemostasis takes place. This involves a cascade of enzymatic reactions that result in the formation of '''[[fibrin]]''' strands, which cross-link and form a stable clot over the platelet plug.

== Clinical Significance ==

Abnormalities in platelet plug formation can lead to bleeding disorders such as '''[[von Willebrand disease]]''' and '''[[Bernard-Soulier syndrome]]'''. On the other hand, excessive platelet plug formation can result in thrombotic disorders such as '''[[deep vein thrombosis]]''' and '''[[myocardial infarction]]'''.

== See Also ==

* [[Hemostasis]]
* [[Coagulation]]
* [[Platelet]]
* [[Thrombosis]]

[[Category:Blood]]
[[Category:Hematology]]
[[Category:Cardiovascular system]]

{{stub}}

Platelet plug - Revision history

Prab: CSV import

Prab: CSV import

Prab: CSV import