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Published byLoreen Bates Modified over 9 years ago
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Robert Hooke (1665) - saw tiny, empty compartments in cork - called them “cellulae” (Latin for “small room”) - they were actually walls of dead cells Antonie van Leeuwenhoek - observed little “animalcules” - studied living cells - together with Hooke, began the study of cells = CYTOLOGY
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History of Cell Theory Robert Brown (1820s) - a botanist - observed a sphere-like structure in every plant cell he examined - called the structure a “nucleus” Theodor Schwann and Matthias Schleiden (1830s) - a zoologist and a botanist - together proposed that each cell develops as an independent unit Rudolf Virchow and Robert Remak (1855) - concluded that every cell originated from the division of another cell
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Cell Theory 1.All living things are made up of cells. 2.The cell is the basic structural and functional unit of life. 3.All cells arise from pre-existing cells.
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Cells Micrometres (μm) are used to measure cells 1 μm = 1 x 10 -6 m or 0.000001 m Cells range in size about 1 μm and 100 μm How big is the “largest” cell? Nutrients (for energy) are taken into the cell and waste products are removed from the cell via the semi-permeable plasma membrane [video].[video]. Cells maximize their surface area while minimizing their volumes so that nutrients and waste products do not have to travel far.
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