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CELLS (II) (Scientifics (Schleiden and Schwann: Schleiden concluded that…
CELLS (II)
Scientifics
Schleiden and Schwann: Schleiden concluded that plant tissues were made up of cells and Schwann expanded this theory to animals and said cells were the basic unit of life
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Ramón y Cajal: He studied nervous tissues and proved that nuerons are the anatomical and functional unit of the nervous system
Hooke: he was the first person to use a microscope with several lens and he discovered tiy cells observing cork
Margullis: she developed a theory promoting that eukaryotic cells have their origin in prokaryotic cells
Leeuwenhoek: He discovered small living things in pond water using a microscope developed by himself.
Interaction function
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Cell movement
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Contractile movement: is characteristic of muscle cells, which are able to contract and relax
It's closely linked with the cytoskeleton, organelle which enable the cell to move with its contractile structures
Amoeboid movement: is characteristic of amoebas. In order to move, amoebas send out protrusions of cytoplasm from anywhere on their surface
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Reproduction function
It takes place in
Multicellular organisms: cell division enbales the organism to increase its size and to replace the cells in the body that die off
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How cells divide
DNA replication: the duplication of hereditary information. The DNA must be equally distributed so the daugfhter cells have the same amount of hereditary information
Cytoplasm division: the distribution of contents of the parent cell among the daughter cells. It doesn't need to be equal.
Is the process by which a parent cell divides in two or more identical cells called daughter cells. Is called cell division
Types of cell division
Budding: The parent cell divides into two daughter cells, one of which develops a small bud on the other. This is how unicellular fungi divides
Spores: the parent cell forms daughter cells with the form of spores, which are kept inside until the membrane crusts.
Fission: The parent cell divides into two daughter cells of the same size. Most of the human cells divide this way.
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