Ch: 13 Diffusion And Osmosis Flashcards
Cell membrane
Boundary of the cell that controls what enters and exits the cell
Selectively permeable
Allows some substances/ molecules to pass through but not all
Diffusion
Movement of molecules from areas of high concentration to areas of low concentration
Solvent
Liquid that dissolves other substances
Solute
A substance that has been dissolved
Osmosis
Movement of water molecules from a region of high water concentration to a region of low water concentration through a semi-permeable membrane
Turgor pressure
The pressure of the content of a cell against its cell wall
Plasmolysis
The loss of a water from the cytoplasm and the movement of the cell membrane away from the cell wall
Passive transport?
No energy required
Difference between hypertonic and hypotonic
Hypotonic = more concentrated
Hypertonic = less concentrated
Active transport
Process where chemicals are taken into a cell against the diffusion/ concentration gradient
How sugar or salt is used to preserve food?
When food is placed in a sugary or salty solution, the bacteria and fungi present in the food will lose the water from their cells and die
Animal cells in a hypertonic solution
The cell would fill with water, burst and die
Animal cells in a hypotonic solution
The cell will lose water,shrivel and die
Plant cells in a hypertonic solution
Water moves into the cell through osmosis and the cell does not burst because it is surrounded by the cell wall.
