Blood is a viscous liquid with which blood vessels are filled. It rushes through all the organs of the body as a result of the contraction of the heart muscle. The blood transports oxygen from the lungs to the tissues, and also transports nutrients to the cells in order to produce the energy needed for the body. Blood consists of: plasma, and cells Red blood, white blood cells, and platelets, so we will introduce you in this article to the function of one of the basic components of blood, which is platelets.
They are cells, or flattened parts of the cytoplasm, with a diameter of approximately three nanometers, and they have many shapes, and platelets do not include a nucleus, or cellular muscles, and their annual life is from seven to ten days, and they have a high ability to bond, and adhesion Some of them, making them play a necessary role in the process of blood clotting, and their number ranges between 150,000 and 400,000 in cubic millimeters.
The main function of platelets is to stop bleeding by forming clots, or clots that stop the blood flowing as a result of an injury, and it also secretes some necessary substances, such as adrenaline, histamine, and serotonin, which play an important role in the contractions that occur in blood vessels, in addition to contributing to the The process of phagocytosis by association with microbes that are ingested by phagocytic cells.
It is possible to donate platelets to others, and the percentage of platelets that can be donated in a normal situation ranges between 200-400 milliliters, and the donation process takes approximately sixty minutes, and it occurs by drawing blood from which platelets are extracted, and then it is returned to the person again by a device Special medical.
It is possible that the proportion of platelets decrease in large quantities, and this is accompanied by the appearance of a rash with red spots that is found most often on the feet and ankles, and this deficiency results in internal bleeding, such as stomach bleeding, or bleeding inside the brain, and the reason for this deficiency is due to the injury of the individual Viruses, such as smallpox, the common cold, or a defect in the immune system, and taking medicines without consulting a doctor, or as a result of viral vaccinations.
It was believed in the past, specifically before the beginning of the twentieth century, that blood is only one type, and is similar among all humans. When attempts were made to transfuse blood from healthy individuals to other patients, the sick person often dies, and as a result, blood transfusions were prohibited for a long time in Europe. This remained the case until the Austrian scientist Karl Landsteiner discovered blood products in 1902, after noting the death of patients when blood was transfused to them, and the products were glycoproteins found on the surface of red blood cells. : A,B,AB,O.
What is the function of blood platelets?