When would crenation and lysis occur?

Crenation is the loss of water from an animal cell due to osmosis. Lysis is the rupture of the cell wall due to too much water moving into an animal cell due to osmosis. Both crenation and lysis have drastic effects on the animal cell. Crenation is the equivalent of flaccid plant cells and lysis is the equivalent of turgid for plant cells. The key difference between lysis and turgid is that plants have a cellulose cell wall so do not rupture or burst the cell wall like animal cells with lysis do.