Animal Unit. November 8, 2010. Multicellular Organisms. Animals are multicellular organisms. Cells. In multicellular organisms, different cells have different jobs.
November 8, 2010
A muscle is muscle tissue that is made up of many muscle cells.
The heart is an organ that functions as a pump. It has muscle tissue, which pumps the blood, and nerve tissue, which signals when to pump.
Nervous System –enables a response to changing conditions.
Muscular System – produces movement and supplies heat.
Respiratory Systems – takes in oxygen and releases carbon dioxide.
Organ systems allow multicellular organisms to obtain large amounts of energy, process large amounts of materials, respond to changes in the environment, and reproduce.
This organization is called the levels of complexity.
Specialized structures perform specific functions at all levels of complexity.
Leaves on trees
Wings on birds
Where do they live?