Levels of Organization
Levels of Organization
• Cells
o have a particular structure and function
o specialized cells may not perform life functions well and may need other specialized cells to survive
o Examples: muscle cells, red blood cells, nerve cells
• Tissues
o Groups of specialized cells that have the same structure and function
o Tissue cells have an increased ability to perform a task or function
o Examples: Blood, brain tissue, stomach muscle tissue
• Organs
o Structures formed by various organized groups of tissues
o Consist of at least two tissues
o Perform specific functions
o Examples: Heart, brain, stomach
• Systems
o Functional groups of organs; work closely with each other to perform a common purpose
o Many organ systems interact with the external environment
o Organ systems share their products with other body cells
o Examples: Circulatory, nervous, digestive
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