Regulating The Cell Cycle

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Presentation transcript:

Regulating The Cell Cycle

Not all cells divide! Muscle cells and nerve cells do not divide once they are developed

Some cells divide frequently Skin, digestive lining, blood cells

How does a cell know if it should divide? Contact: when cells come into contact with one another they stop dividing Density: when cells are too crowed, they stop dividing

Cyclins: -proteins that regulate cell cycle in eukaryotic cells High cyclin = cell division Low cyclin = no cell division

Cyclins: Messages from within the cell: internal regulators Messages from outside cell: external regulators Both control the production of cyclin

Cancer: Uncontrolled Growth Cancer cells ignore normal cell signals and divide constantly form masses = tumors can damage surrounding tissues

Cancer: Uncontrolled Growth Causes of cancer can be different: smoking tobacco, radiation exposure, chemical exposure, viral infections

Cancer: Uncontrolled Growth All cancers have 1 thing in common: The control over the cell cycle has broken down!!

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