LS1.2 - Organization

In multicellular organisms cells are often organized into tissues. Tissues are often made up of more than one type of cell. Several tissues are organized into organs and organs are part of an organ system. For example, cardiac muscle cells make up cardiac muscle tissue, which is part of the heart organ. The heart is a main organ within the cardiovascular or circulatory system. There are many body systems that work together so that the body can function properly.