Cell Theory and Organization
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What is a cell?
Cell- basic unit of life
What do cells do?
Cells carry out basic life processes like obtaining oxygen and
food, and getting rid of waste
Unicellular-
Unicellular- organisms made of one cell (ex- bacteria)
Multicellular-
Multicellular- organisms made of many cells (ex- humans)
Hooke-
First to look at cells- Robert Hooke
•
Looked at cork, named a cell a cell
Leeuwenhoek-
First to look at living organisms- Anton van Leeuwenhoek
• Called organisms ‘animalcules’
What is the cell theory?
Cell theory explains relationship between cells and organisms
Parts of the cell theoryX
Parts of cell theory1) All living things are composed of cells
2) Cells are the basic units of structure and function in living things
3) All cells are produced from other cells
What are the levels of
organization in living things?
Levels of organization in multicellular organisms:
1) Cell- basic unit of life
 Ex- neuron
2) Tissue- group of similar cells that perform a specific function
 Ex- nervous tissue
3) Organ- different tissues that perform a specific function
 Ex- brain
4) Organ system- group of organs that work together to perform a major
function
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SUMMARY
X
Ex- nervous system
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5) Organism- living thing
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X
Disease examples-
Failure of any level can affect the entire system, and the entire organism
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X
SUMMARY
X
Ex- human
Tay-Sachs (build up of fat in neurons)
Multiple sclerosis (covering on neurons breaks down)
Epilepsy (neurons firing too frequently)