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Lysis ( Greek ''lusis'' from ''luein'' = to separate) refers to the death of a cell by bursting, often by viral or osmotic mechanisms that compromise the integrity of the cellular membrane. Viral lysis Viral lysis is the dissolution of cells by the action of a specific Cytolysin , a substance that explicitly causes the death of the cell. Viral lysis can be caused through the Lytic Cycle , where a Phage infects a cell. The nucleic acid from the phage enters the cell, causing the assembly of more of the viruses. Eventually, the viruses break through the cell membrane of the cell, causing viral lysis. Cytolysis See Also: Cytolysis Cytolysis is the Lysis of Cells by Osmotic means. Cytolysis is caused by excessive osmosis, or movement of Water , towards the inside of a cell. The Cell Membrane cannot withstand the Osmotic Pressure of the water inside, and so it Explode s. Osmosis occurs from a region of high water potential to a region of low water potential passing through a Semipermeable Membrane , so these bursting cells are located in hypotonic environments. Cytolysis can be prevented by several different mechanisms, including the Contractile Vacuole that exists in some Paramecium which rapidly pump water out of the system of the cell. Plasmolysis See Also: Plasmolysis Plasmolysis is the contraction of Cell s within Plant s due to the loss of water through Osmosis . In a hypotonic environment, the cell membrane peels off of the Cell Wall and the Vacuole collapses. These cells will eventually wilt and die unless the flow of water caused by osmosis can stop the contraction of the Cell Membrane . See also |