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Published byLisa Tyler Modified over 8 years ago
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ORGANIZATION Cells are the basic unit of life: Living things are made of cells Life functions happen in cells
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Cells work together to make- TISSUES Tissues are a group of cells doing a similar function, such as muscle tissue
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Similar tissues work together - -to make ORGANS Organs are similar tissues working together to accomplish a life function.
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Organs are grouped together in -organ SYSTEMS Systems work together to perform life functions
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COMPLEX ORGANISMS -are made of many organ systems These organ systems each perform specific functions and together, they maintain homeostasis.
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Not all organisms Have all these levels of organization. Some organisms are unicellular, so they will not have tissues or organs, only organelles.
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Simpler organisms Will only have tissues, such as this planaria.
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Homeostasis Is easier to maintain if you are multicellular, as long as you have this “division of labor”
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Mitosis Creates this organization because cells produce exact copies of themselves: If it is a liver cell, it will produce another liver cell.
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The DNA -In each cell of a multicellular organism is an exact copy of the first, original cell of that organism, but as the organism developed, cells differentiated, or took on a specific structure for a specific job.
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DNA carries the instructions -for each cell, but parts of the DNA are “turned on”, or active, and parts are”turned off” Remember, the fragment of a chromosome that carries instructions for a specific protein is the GENE
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From smallest to largest- DNA Gene Chromosome Cell Tissue Organ Organ System Organism Population Community Ecosystem Biome Biosphere!!
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