Circulatory System
Platelets are flattened discs that are round from above and spindle shaped section. Megakaryocytes are very active cells that continually make proteins, enzymes, and membranes. But instead of getting bigger. They just shed small membrane-enclosed packets of cytoplasm into circulation. This is where platelets come from. Platelets were once thought to had lost their nucleus so histologists called them thrombocytes. They are constantly getting replaced. A platelet circulates for about 10 - 12 days and are removed by phagocytes. Platelets help in a vascular clotting system, which also has plasma proteins and the cells and tissues of the circulatory network. Homostasis prevents the loss of blood throughout damaged vessels. In this it stops blood lose and makes framework for the tissue repair.Other Functions of platelets include: Transport of chemicals important to the clotting process, Formation of temporary patch in walls of damaged blood vessels, And active contractions after clot formation have taken place. 2. Blood Clots have 3 phases of formation: ] Thromboplastin triggers clotting by converting prothrombin into thrombin. Some thrombin is released when platelets disintegrate at the site of vascular injury. The injured tissue
] In this stage prothrombin is converted into thrombin by both intensive and extensive thromboplastin and several plasma coagulating factors. 5. Vitamin K consists of substances that are essential for the clotting of blood. It was identified in 1934 by Danish biochemist Henrik Dam. Two types of K vitamins have been isolated: K1, an oil purified from alfalfa concentrates, and K2, synthesized by the normal intestinal bacteria. Both can be derived from the synthetic compound menadione, a yellow crystalline solid that is as potent in its ability to promote blood clotting as the natural vitamins. The best sources are leafy green vegetables, such as cabbage and spinach, and intestinal bacteria, which are most of the body's supply of vitamin K. Vitamin K is required for the synthesis in the liver of several blood clotting factors, including prothrombin. Coumarin derivatives, used in medicine to prevent blood coagulation in certain cases, act by antagonizing the action of vitamin K. In the deficiency state an abnormal length of time is needed for the blood to clot, and there may be hemorrhaging in various tissues. Deficiency occurs in hemorrhagic disease of the newborn infant, in liver damage, and in cases where the vitamin is not absorbed properly by the intestine. ] The atria and ventricles are relaxed.
Some common words found in the essay are:
Henrik Dam, BP Semi, Blood Clots, , IgM IgG, blood cells, blood pressure, blood vessels, white blood, white blood cells, red blood cells, semi lunar valves, semi lunar, red blood, lunar valves, plasma proteins, av valves, donor person blood, extra hard, blood cells rise,
Approximate Word count = 1834
Approximate Pages = 7 (250 words per page double spaced)
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