what is the function of platelets in our blood?

Blood platelets are tiny cell fragments that play a critical role in blood clotting. They are produced in the bone marrow by large cells called megakarocytes. These cells break apart to form platelets, which then circulate in the blood.



Platelets normally start the clotting process when they're exposed to the air, such as in a cut or wound. These cell fragments fall apart even more and react with a protein called fibrinogen. With the help of vitamin K and calcium, fibrinogen forms a mesh of tiny threads that collects red blood cells, which plug the open blood vessels as it dries. This is a clot.



There are many millions of platelets in the human body, but the number varies with a person's size and blood volume. A better way is to measure the number of platelets in a given volume of blood. There are normally between 150,000 and 300,000 platelets in a cubic milliliter of blood. About 473 cubic milliliters make one pint.




When the number of blood platelets is too low, blood takes longer to clot, which presents an obvious danger if the person is wounded. A lack of vitamin K or calcium produces the same effect. (Many other factors are involved in clotting; these are just the basics.)



In some diseases, the number of platelets rises so high that blood clots too easily, even without a wound. This is also dangerous, because the blood clot can become detached and travel through blood vessels until it becomes stuck. This can cut off the flow of blood to tissue "downstream" from the clot. If it happens in the heart, the clot causes a heart attack. In the brain, a blood clot causes a stroke.



Atherosclerosis, or hardening of the arteries, can also cause internal clotting. Deposits of cholesterol and calcium build up inside arteries, narrowing them and providing a rough, sticky surface that attracts platelets.



Those at risk of heart attack may be placed on anti-clotting medications. Aspirin is the cheapest, easiest and safest medicine. Aspirin alters the structure of platelets so they are less likely to clot. This effect lasts throughout the life of the platelets exposed to aspirin. Since new platelets are being formed continuously, the blood clotting properties return to normal gradually when aspirin is no longer taken.



Aspirin works by other mechanisms on other factors in the blood clotting process, making it extremely powerful. People with an excessive tendency to bleed, or those on blood thinners such as coumadin, should not take aspirin unless advised to do so by a doctor.

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platelets help in blood clotting.

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Funtions Of Platelete During Bleeding:-

 

Platelets provide the necessary hormones and proteins for coagulation {change from a liquid to a thickened or solid state} . Collagen is released when the lining of a blood vessel is damaged. The platelet recognizes collagen and begins to work on coagulating the blood by forming a kind of stopper, so further damage to the blood vessel is prevented.

A higher than normal count of platelets, known as thrombocytosis, can cause serious health risks. Too much clotting of the blood can lead to formation of blood clots that can cause stroke. Conversely, lower than normal counts can lead to extensive bleeding

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Platelets are components of blood and are membrane bound cell fragments which lack nucleus. They help in the clotting of blood during an injury

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Platelets - Platelets are components of blood and are membrane bound cell fragments which lack nucleus. They help in the clotting of blood during an injury. Platelets aggregate at the site of wound and forms the clot.They releases certain chemicals at the site of injury. Thus, in this way platelets stops bleeding.

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they clot the blood whenever it flows out of the body and prevent overflow of blood from the body.

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Platelets or thrombocytes are the cell fragments circulating in the blood that are involved in the cellular mechanisms of primary hemostasis leading to the formation of blood clots. Dysfunction or low levels of platelets predisposes to bleeding, while high levels, although usually asymptomatic, may increase the risk of thrombosis. An abnormality or disease of the platelets is called a thrombocytopathy.


Functions of Platelets can be generalised into a number of categories:

* Adhesion
* Aggregation
* Clot retraction
* Pro-coagulation
* Cytokine signalling
* Phagocytosis

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 Blood platelets are tiny cell fragments that play a critical role in blood clotting. They are produced in the bone marrow by large cells called megakarocytes. These cells break apart to form platelets, which then circulate in the blood.

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They clots the blood when it flows out of our blood & prevent overflow of blood.
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omg very lengthy
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Platelets are substances in human blood. Their function is clotting of blood during the time of injury.
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