Platelet, Thrombocyte

A platelet, or blood plate, is a flattened oval anucleate fragment of megakaryocytes with a diameter of 2-4 microns, present in the blood. After blood is stained with Romanowsky dye, platelets appear as fragments of pale blue cytoplasm containing several red granules.

Platelets have several functions in the body, all of which involve stopping bleeding and participating in the blood clotting process. They also participate in the body's defense reactions and produce platelet-derived growth factor.

Normally, 1 liter of blood contains 150-400 billion platelets. They are formed in the bone marrow during the process of thrombopoiesis from megakaryocytes.

Platelet, Thrombocyte: structure and functions

A platelet, also known as a platelet or platelet, is an important component of the blood responsible for stopping bleeding. These flattened, oval, anucleate fragments of megakaryocytes range from 2 to 4 μm in diameter and contain several red granules in pale blue cytoplasm. In this article we will look at the structure and functions of platelets in the body.

The structure of platelets

Platelets are formed in the bone marrow from megakaryocytes and are released into the blood in the form of disc-like fragments that restore their shape upon contact with collagen and other surfaces. Each platelet consists of three main parts: a peripheral zone, a tubular system, and a central probe. The peripheral zone contains granules that contain proteins and clotting factors such as thromboxane A2, fibrinogen, growth factors and others. The tubule system is a network of tubules that contain microtubules and microfibrils that are responsible for contraction and change in cell shape. The central probe contains mitochondria, which are responsible for the energy supply of the cell.

Platelet functions

The main function of platelets is to stop bleeding when blood vessels are damaged. Upon contact with a damaged vessel wall, platelets are quickly activated and begin to aggregate, forming the initial platelet clot. They then begin to release clotting factors, which lead to the formation of fibrin, which anchors the clot and forms a thrombus. This causes bleeding to temporarily stop and allows the body to begin the process of repairing damaged tissue.

In addition, platelets are involved in other protective reactions of the body. They release growth factors that promote tissue regeneration and wound healing. They can also bind and destroy bacteria and viruses, playing an important role in the body's immune system.

In conclusion, platelets are an important component of the blood and perform many functions related to stopping bleeding and protecting the body. They have a complex structure and mechanisms that allow them to perform their functions effectively. Knowledge of their structure and functions is important for understanding the mechanisms of blood coagulation and general processes in the body. Normal blood platelet levels range from 150 to 400 x 10^9 cells per liter of blood, and any deviation from this level may indicate the presence of a disease. Therefore, it is important to monitor your health and seek medical help if necessary.

Platelets, also known as platelets, are one of the most important components of blood. They play a key role in stopping bleeding and protecting the body from infections. In this article we will look at what platelets are, how they function and what they mean for human health.

Platelets are the nuclear-free fragments of megakaryocytes - cells that are formed in the red bone marrow. They are oval in shape and have a diameter of about 2-4 microns. When blood is stained, platelets appear as pale fragments of cytoplasm with a few red granules.

The main function of platelets is to stop bleeding. This occurs due to their ability to adhesion - sticking to the damaged surface of the vessel. Platelet adhesion occurs due to the presence of special proteins on their surface - glycoproteins.

In addition to stopping bleeding, platelets are also involved in the body's immune responses. They can trap and digest foreign particles such as bacteria and viruses. In addition, platelets produce platelet-derived growth factor, which promotes the formation of new platelets and wound healing.

Normally, the blood of a healthy person contains about 150-400x10^9 platelets per liter. However, in some diseases, such as thrombocytopenia or thrombocytosis, the platelet count may be altered. Thrombocytopenia is a decrease in the number of platelets in the blood, which can lead to increased bleeding and the risk of bleeding. Thrombocytosis is an increase in the number of platelets, which can cause thrombosis and other blood clotting problems.

Conclusion: Platelets are important components of blood that play a key role in its coagulation and protective functions.