The study of the structure of living things is called anatomy. All animals are made up of CELLS, some of which are specialized to carry out different functions. Simple animals, such as sponges, are made up of only a few types of cell. In more complex animals, cells are organized into tissues, such as muscles and nerves that are necessary for movement. Tissues can form organs, such as the heart, which is used to pump blood around the CIRCULATORY SYSTEM.