Thrombocytes | Blood Platelets

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Thrombocytes

• In mammals thrombocytes are called blood platelets.
• Number. They are fewer than the RBCs and more than the WBCs in number.
• Blood normally contains 1,50,000–3,50,000 mm platelets of blood. Increase and decrease in the number of platelets is known as thrombocytosis and thrombocytopenia respectively.

• Shape. Blood platelets are really cell fragments rather than true cells . They are rounded or oval disc like bodies.

• Size. Platelets are 2–3 micrometres in diameter. Thus they are much smaller than both the red and white blood corpuscles.

• Colour . Platelets are colourless.

• Structure. They are flat and non - nucleated fragments of the cells. They are simply bits of protoplasm, bounded by a membrane and contain a few cell organelles and secretory granules in the cytoplasm.
• They have a group of basophilic granules in the centre which give the appearance of a nucleus

• Formation. Platelets are formed from the megakaryocytes (very large cells of the bone marrow).
• Formation of thrombocytes is called thrombopoiesis.

• Life span. Normal life span of blood platelets is about a week.

• Function. When an injury is caused, the blood platelets release certain chemicals which are called the platelet factors (e.g. , thromboplastin).
• The platelet factors help in the clotting of blood. 

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