CONNECT

All living things are made up of one or more cells. Therefore, the basic processes of life are the results of what happens inside cells. Cells are often aggregated into tissues, tissues into organs, organs into organ systems. Organisms range in composition from a single cell to multicellular organisms, in which different groups of larger numbers of cells work together to form systems of tissues and organs (circulatory, respiratory, nervous, etc.) that are specialized for particular functions. The complex ladder that makes up living things represents the direct relationship between cells, tissues, organs, and organ systems. In this lesson, students will develop and use a model to demonstrate and explain the important relationship between cells, tissues and organs to maintain life.