Thrombocytes or Blood Platelets

The thrombocytes commonly known as the blood platelets do not have nucleus as observed by means of microscopy using a microscope like the teaching-microscope. The blood platelets of mammals were never nucleated cells, not like the erythrocytes that are also absent of nucleus. Thrombocytes are actually the remains of the cytoplasm of extremely huge thrombocyte precursor cells called as the megakaryocytes. Similarly with other cells included in the development of the blood cells, megakaryocytes are located in the bone marrow. Blood platelets are approximately three micrometers in length but seem rather tinier in the microscope such as the teaching-microscope. This is due to their cytoplasm that was split into two areas, the inner and the outer sections. The granulomere that has bluish staining granules and considered as the inner section, and the hyalomere that barely stains and known as the outer section. The granules are typically not singly apparent with the greatest magnification under a microscope, and the granulomere seems relatively homogeneous in blue. The other particles present in the thrombocyte granulomere aside from the granules are the mitochondria, lysosomes, tiny erythrocytes and the ribosomes as observed under the microscope such as teaching-microscope. Various forms of vesicles have serotonin or compound essential for blood coagulation. The serotonins are the electron-dense delta granules while the compounds necessary for blood coagulation or the alpha granules are the ones having platelet derived growth factor that has a role in the reparation of the injured tissue. The hyalomere has cytoskeletal fibers that involve actin and myosin as observed via microscopy using the teaching-microscope.

Blood platelets help in the haemostasis or the arrest of bleeding. The serotonin is known to be a potent or powerful vasoconstrictor. The discharge of serotonin from the blood platelets that hold on to the sides of injured vessels is enough to close even the tiny arteries. The thrombocytes that connect with the collagenous fibers in the sides of the vessel inflame turn sticky and stimulate other blood platelets to experience the same conversion. This flow of events ends-up in the production of a platelet plug or platelet thrombus. Ultimately, stimulated materials are discharged from the injured vessel walls and from the thrombocytes. The said materials intervene in the transformation of the plasma protein prothrombin into thrombin. The thrombin catalyzes the transformation of fibrinogen into fibrin that polymerizes into fibrils and develops a fibrous net in the appearing blood clot. Blood platelets caught in the net of the fibrin tighten resulting to clot retraction that further helps in haemostasis. Blood coagulation is somewhat a complicated procedure that includes a huge number of other proteins and courier materials. Either inherited or acquired, insufficiencies in any one of them will end-up to destruction of haemostasis. The thrombocytes will come out light blue, somewhat poorly defined flecks among other blood cells in slightly stained smears as viewed under the microscope such as teaching-microscope. While in darker smears, the observer will see under the microscope such as teaching-microscope that the blue flecks are developed through build up of tiny bluish grains, which are the granules of the thrombocytes. The precursors of blood platelets are the haemopoietic cells, which are not hard to discover in red bone marrow. Under the microscope at low magnifications, the extremely dark and huge megakaryoblast and the bigger but light megakaryocytes are noticeable. The adipocytes also exist in the red bone marrow. Read more