(redirected from Blood platelets)
Also found in: Dictionary, Thesaurus, Medical.


see blood clottingblood clotting,
process by which the blood coagulates to form solid masses, or clots. In minor injuries, small oval bodies called platelets, or thrombocytes, tend to collect and form plugs in blood vessel openings.
..... Click the link for more information.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(also thrombocyte), a formed element found in the blood of vertebrate animals and man that plays an important role in blood coagulation. The platelets of vertebrate animals (except mammals) are small ovoid cells with a solid nucleus and weakly basophilic cytoplasm. In mammals, including man, platelets are anuclear bodies 2–5 µ in diameter. The platelets normally number about 250,000–350,000 per cubic mm of blood. They have granules containing serotonin and substances involved in blood coagulation, as well as mitochondria, microtubules, glycogen granules, and sometimes ribosomes. In mammals, platelets originate in the blood-forming organs when fragments of the cytoplasm of megakaryocytes separate from the megakaryocytes. The life-span of the platelets of mammals, including man, is about five to nine days.


Markosian, A. A. Fiziologiia trombotsitov. Leningrad, 1970.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


A small ice crystal which, when united with other such crystals, forms a layer of floating ice, especially sea ice, and serves as seed crystals for further thickening of the ice cover.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


a minute cell occurring in the blood of vertebrates and involved in clotting of the blood
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
The study consisted of the medical records of 40,000 individuals, and results showed that more than 11 percent of men and 6 percent of women over the age of 40 with high blood platelet count went on to be diagnosed with cancer within a year.
Incubation of plasma or blood platelets (control, plant extract and [H.sub.2][O.sub.2]- or [H.sub.2][O.sub.2]/Fe-treated plasma, plant extract, and thrombin-treated platelets) was stopped by cooling the samples in an ice bath.
Blood platelets were isolated by double centrifugation taking advantage of the differences in the specific weight of the respective morphotic elements of blood.
For 75% of patients with normal blood platelet counts, time off chemotherapy was associated with improved quality of life.
During a transfusion, any one of several blood components may be transfused, including blood platelets, which help blood clot; red cells, which carry oxygen; and plasma, the watery fluid that transports cells and nutrients and replaces blood volume.
It comes at a time when demand for blood is high, especially for blood platelets, which help prevent bleeding.
Doctors say the cases are spiralling as panicky patients insist on blood transfusion even when they don't need it and also because infected persons are donating blood platelets.
The doctor said it is basically the massive decline in blood platelets which leads to haemorrhage among the dengue fever patients causing shock syndrome and even possible death.
Effient is said to help keep blood platelets from sticking together to form clots, which can block an artery.
The study will focus on blood platelets, which in people with cardiovascular disease stick together, forming blood clots and blocking blood vessels.
BloodSTOP interacts with blood platelets and fibrin to form a gelatinous, clear shield that effectively seals the wound.