The Treaty of Kanagawa was an 1854 agreement between the United States of America and the government of Japan. The treaty, which was essentially imposed on the Japanese by threat of force, opened two Japanese ports for trade with American ships. The treaty was the first modern treaty Japan had with a western nation.
Platelets have no cell nucleus: they are fragments of cytoplasm that are derived from the megakaryocytes of the bone marrow, and then enter the circulation. These unactivated platelets are biconvex discoid (lens-shaped) structures, 2â3 Âµm in greatest diameter.
Our bone marrow produces blood cells, called red blood cells, platelets, and white blood cells. Inside the marrow, blood cells start off as young, immature cells called stem cells.lood is made up of red blood cells, platelets, and different kinds of white blood cells. These cells are all suspended in liquid plasma. Our immune system protects the body from disease. It kills unwanted micro-organisms such as bacteria and viruses that may invade our bodies.