Osmosis Flashcards
what is osmosis?
Osmosis is the net diffusion of water from a dilute solution across a partially permeable membrane.
what is an isotonic solution?
the concentration of solution outside the cell is the same as the concentration of inside the cell
what is a hypertonic solution?
the concentration in the solution is higher than the concentration inside the cell
what is a hypotonic solution?
the concentration of the solution is lower than the inside of the cell the solution
What is Active Transport?
Particles move from an area of low concentration to an area of high concentration , across a partially permanable membrane
This requires energy (and special transport protein)
what happens when water leaves a plant cell? why?
If more water is lost by osmosis , the vacuole and cytoplasm shrink, and eventually the cell membrane pulls away from the cell. This is plasmolysis.
what happens when water enters a plant cell? why?
Water moves into plant cells by osmosis causing the vacuole to swell which presses against the cytoplasm against the planet cell wall. The pressure builds up until no more water can physically enter the cell. The pressure is known as turgor. Turgor pressure makes the cells hard and rigid.
what is lysis in animal cells? why does it happen?
Animal Cells placed in a dilute solution will take in water and therefore burst. Thsi is called lysis.
what is crenation in animal cells? why does it happen?
Animal Cells placed in a concentrated solution will lose water and therefore shrivel. This is called crenation.
what is a dilute solution?
A dilute solution of sugar contains a high concentration of water ( the solvent). It has a low concentration of sugar ( the solute ).
what is a concentrated solution?
A concentrated sugar solution contains a relatively low concentration of water and a high concentration of sugar.
