Neville Chamberlain, Prime Minister of Britain, met with Hitler three times during September 1938 to try to reach an agreement that would prevent war. The Munich Agreement stated that Hitler could have the Sudetenland region of Czechoslovakia provided that he promised not to invade the rest of Czechoslovakia.
Body Systems: Tissues. At this point students know that cells make up all living things. But cells do not work independently within complex organisms such as plants, animals and of course people. Cells work together in organisms like people in an organized way that allows that organism to survive. This page explains how complex organisms are organized or another way of looking at it would be to say how complex living things are built. All complex organisms are made of groups of cells called tissues. Histologists are scientists that are experts on tissues. Tissues are groups of cells working together to get a certain job done. There are four basic types of tissues that make up the body --->. Organs are a groups of different tissues working together to complete a life function. Organ systems are many organs, tissues and cells working together to complete a life function.
Most of the time, each cell has a specific job to do. One cell can't do what another cell can, just as a doctor isn't trained to design a bridge and an engineer can't do surgery. So cells work as a team, grouping together to make up our tissues and organs. But one type of cell is different. Stem cells can develop into cells with different skills. In that way, stem cells are like students who have the choice of studying to be either doctors or engineers. None of the body's other cells can become new cells like this. Blood Stem Cells. When you hear about stem cell transplants, they probably involve hematopoietic (pronounced: heh-mat-uh-poy-ET-ik) stem cells. These stem cells are produced in the bone marrow and form blood and immune system cells. Hematopoietic stem cells can become any of three different types of blood cells: red blood cells that carry oxygen; white blood cells that fight infection; platelets that help blood to clot