To burn food for the release of energy stored in it, oxygen must be
supplied to cells, and carbon dioxide removed. Lungs take in oxygen for
the combustion of food and they eliminate the carbon dioxide produced.
The urinary system disposes of dissolved waste molecules, the intestinal
tract removes solid wastes, and the skin and lungs rid the body of heat
energy. The circulatory system moves all these substances to or from cells
where they are needed or produced, responding to changing demands.
NSES Content Standard C
Life Science: Structure and function in living systems Grades 5-8, page 156 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 functional units, called organs. Each type of cell, tissue, and organ has a distinct structure and set of functions that serve the organism as a whole. NSES Content Standard C
NSES Content Standard C
NSES Content Standard C
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