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Microscope/Cell Theo
Microscope/Cell Theory Science 7
Term | Definition |
---|---|
simple microscope | microscope with only one lens that uses light to magnify |
compound microscope | uses two lenses and light to magnify |
arm | supports body tube; used with base to carry microscope |
base | bottom of microscope; used with arm to carry microscope |
coarse adjustment | quickly moves stage up and down; used first to focus image |
diaphragm | controls the amount of light on the slide |
fine adjustment | sharpens image; used second to focus image |
light source | illuminates the slide on the stage |
nosepiece | holds the objective lenses |
objective lenses | magnifies and focuses the image inside the body tube |
ocular lens | also called eyepiece; magnifies image |
stage | where the slide is placed |
stage clips | holds the slide in place |
cell theory | 1. all organisms are composed of one or more cells 2. a cell is the basic unit of structure and organization in organisms 3. all cells come from pre-existing cells |
Van Leeuwenhoek | discovered bacteria (aka animalcules) |
Hooke | coined the term "cell" after looking at cork under microscope |
Schleiden | all plants are made of cells |
Schwann | all animals are made of cells |
Virchow | cells come from other cells |
body tube | separates the objective and eyepiece |