Chapter 5

Cooking Up Some Energy in the Mitochondria

In what organelle is the glucose that is absorbed in the intestines used by the cell to provide energy for all body functions?

Is there anything else that is required for energy?

Important levels of organizarion for structure and function include cells, organs, tissues, organ systems, whole organisms, and ecosystems.

All organisms are composed of cells - the fundamental unit of life. Most organisms are single cells; other organisms, including humans, are multicellular.

Specialized cells perform specialized functions in multicellular organisms. Groups of specialized cells cooperate to form a tissue, such as a muscle. Different tissues are in turn grouped together to form larger functonal units, called organs.

Cells carry on the many functions neded to sustain life. They grow and divide, thereby producing more cells. This requires that they take in nutrients, which they use to provide energy for the work that cells do and to make the materials that a cell or an organism needs.