Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Osmosis A simple rule to remember is: Remember, diffusion is… An example… • Salt is a solute. Where ever it is concentrated, it will draw the water in its direction. *This is why you get thirsty after eating something salty. *Popcorn is sold at the movies- why? *Many bars & restaurants serve free popcorn and/or chips…why? • If the concentration of solute (salt) is equal on both sides, the water will move back and forth equally. • "ISO" means the same, or equal. ISOTONIC • The word "HYPO" means low, in this case there are less solute (salt) molecules outside the cell, since salt sucks, water will move into the cell. • The cell will gain water and grow larger. HYPOTONIC • In plant cells, the central vacuoles will fill and the plant becomes stiff and rigid, the cell wall keeps the plant from bursting. • In animal cells, the cell may be in danger of bursting. – Those CONTRACTILE VACUOLES pump water out of the cell to prevent this. Contractile Vacuole P A R A M E C I U M • The word "HYPER" means more. In this case there are more salt molecules outside the cell, which causes the water to be sucked in that direction. • In plant cells, the central vacuole loses water and the cells shrink. • In animal cells, the cells also shrink. HYPERTONIC • This is why it is dangerous to drink sea water. • People marooned at sea will dehydrate faster by drinking the salty sea water. ISOTONIC HYPOTONIC HYPERTONIC