write the short note on platelets
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Q.write the short note on platelets
Answer:- The calculated number of platelets in a volume of blood, usually expressed as platelets per cubic millimeter (cmm) of whole blood. Platelets are the smallest cell-like structures in the blood and are important for blood clotting and plugging damaged blood vessels.
Normal platelet counts are in the range of 150,000 to 400,000 per microliter (or 150 - 400 x 109 per liter). These values many vary slightly between different laboratories.
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Answer:
What Are Platelets?
Remember the last time you cut yourself? You can recall the sharp stab of pain, and the sight of blood slowly oozing out of the wound. As you reach for a bandage, you are probably hoping to minimize the mess of blood. But is your mind racing, trying to figure out how and when you will stop bleeding? Probably not, because you know that your body will take care of that for you. The reason we don't bleed to death every time we are cut is due largely to particles in our blood called platelets.
Platelets are tiny cell fragments that are found within our blood. They originate in the bone marrow as pinched-off pieces of larger cells. Platelets are neither smooth nor round, but are shaped more like paper that has been ripped into tiny bits. They spend much of their time cruising through the bloodstream alongside their red and white blood cell counterparts.
The primary responsibility of the platelets is to stop the bleeding when there is an injury to the body. A barrier called a blood clot must be formed to seal the wound. Just like a leaking pipe must be plugged, a damaged blood vessel must be blocked so that there is not excessive blood loss. But how do the platelets accomplish this task?
Function of Platelets
Let's go back to the scenario in which you cut yourself. You can see that your skin has been broken, and blood is escaping through the opening. Clearly there has been damage to some blood vessels, since you are bleeding. What you cannot see is that an emergency signal has been sent out in your bloodstream, like a dispatcher sending out first responders. This is when the platelets spring into action.
When the cut occurs, signals are sent through the bloodstream notifying cells of the trauma. Platelets in the blood release chemicals that notify other platelets nearby to become activated, or sticky. Once activated, platelets change shape by growing small tentacles. This helps them to stick together.
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