Journal of Physical Therapy and Sports Medicine

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Journal of Physical Therapy and Sports Medicine 44 7897 074717

Thrombocytes-3

 

Platelets, also referred to as thrombocytes (Greek word) are a element of blood whose function (alongside the coagulation factors) is to react to bleeding from blood vessel injury by way of clumping, thereby initiating a blood clot. Platelets have no cell nucleus: they're fragments of cytoplasm which can be derived from the megakaryocytes of the bone marrow, which then input the circulation. Circulating inactivated platelets are biconvex discoid (lens-shaped) structures, 2–3 µm in finest diameter. Activated platelets have mobile membrane projections protecting their surface. Platelets are found simplest in mammals, while in other vertebrates (e.g. Birds, amphibians) thrombocytes flow into as intact mononuclear cells. On a stained blood smear, platelets appear as darkish pink spots, about 20% the diameter of crimson blood cells. The smear is used to study platelets for size, shape, qualitative number, and clumping. A healthy adult normally has 10 to twenty times more crimson blood cells than platelets.

 

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