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Hooke cell theory
Discovered in 1665
Contribution: Contributed the term "cell" to biology. He discovered a honeycomb-like structure in a cork slice. He saw cell walls as dead tissue when he looked into the microscope. He described cells as "empty chambers".
Argument: Hooke discovered what cells actually were when prior to that, people didn't even know what organs were composed of. -
Leeuwenhoek Theory
Contribution: Leeuwenhoek looked at pond water through a microscope he made lenses for, meaning he is the first scientist to discover protozoa and bacteria. He called these tiny, living organisms "animalcules".
Argument: Unlike Hooke, Leeuwenhoek discovered living single-cell organisms. This discovery opened up a door for future scientists when experimenting and researching cells. -
Brown Cell Theory
Contribution: Discovered the nucleus in plant cells and showed the radical motion of molecules by looking at the cells of an orchid under the light of the microscope. Brownian method was named after Brown's discovery of the way that the molecules moved.
Argument: While Leeuwenhoek discovered living cells, Brown discovered a nucleus within the living cells that have never been seen or heard of before. -
Schleiden
Contribution: Schleiden stated that different parts of the plant organism are composed of cells. He recognized the importance of the nucleus. He also concluded that every plant is made up of cells.
Argument: He figured out why the nucleus was an important function in the cell, as Brown only discovered the nucleus without knowing the function of it. -
Schwann theory
Contribution: Schwann reached the conclusion that not only plants, but animal tissue as well is composed of cells. Plants and animals have different cell structures. He concluded that cells are organisms and all organisms consist of one or more cells and that cells are the basic unit of structure for all organisms.
Argument: Schwann figured out new information that animals consisted cells too, but the structures were different. -
Virchow
Contribution: Virchow discovered that cells only develop from existing cells proposed that diseased cells come from healthy cells.
Argument: Virchow figured out how more cells develop
