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
It is characterized by excessive production of immature or mature white blood cells and crowding-out the red blood cells and platelets. If either or both numbers are equal to or greater than 120 over 80 for an extended period of time, you have high blood pressure, or hypertension. Leukemias are classified as either lymphocytic or myeloid, depending on what type of WBC is affected. Hypertension is dangerous because it causes the heart to work extra hard. In humans it can occur at any age, but most types are more common in older people. ] In this stage prothrombin is converted into thrombin by both intensive and extensive thromboplastin and several plasma coagulating factors. Possible causes include exposure to certain chemicals, chromosomal abnormalities like Down syndrome, exposure to ionizing radiation, and certain drugs. Two types of K vitamins have been isolated: K1, an oil purified from alfalfa concentrates, and K2, synthesized by the normal intestinal bacteria. If untreated, death can supervene rapidly in acute leukemia. releases additional thromboplastin, especially vascular walls, with the calcium ions. The plasma proteins are buffers but the amount is small compared to intracellular protein. This is the second and lower number of your blood pressure. If natural pacemakers are injured or fail to do their job, a miniaturized medical device called a cardiac pacemaker can be implanted in the chest.
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