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name the 6 levels of structural organization of the human body
1. chemical level; 2. cellular level; 3. tissue level; 4. organ level; 5. system; and 6. organismal
molecules are organized into cells which are the basic structural and functional living units an organism
(example: muscle cells, nerve cells, blood cells)
cells are organized into tissues to perform a particular function
(example: epitheleal, connective, muscle and nervous tissues)
structures that are composed of 2 or more different types of tissues, that have specific functions and usually have recognizable shapes
(example: liver, stomach, heart, lungs, brain)
system level or organ-system level
consists of related organs with a common function
(example: digestive system, which breaks down and absorbs food, and includes the mouth, salivary glands, esophagus, stomach, small intestine, large intestine, liver, gallbladder and pancreas)
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