System. This level is made up of a group of organs that all work together to carr y out one or more functions. This group of organs is called a system. The organs in a system can have the same type of tissue, such as the muscular system, or dif ferent types, such as the circulator y system. 1 Atom visible with an electron microscope visible to the naked eye visible with an optical microscope Protein Mitochondrion Virus Cell Embryo Vertebra Heart Human being 0.1 nm 1 nm 10 nm 100 nm 1 mm 10 mm 100 mm 1 mm 1 cm 10 cm 1 m Organ. Organs are formed of dif ferent tissues that work together to perform a specific function . For example, the heart. Organism. The complete set of systems all work together to make up the body of the organism. The body is capable of carr ying out all of the life processes. 19
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