Chapter 5/6 Flashcards
Where does diffusion occur
Across membranes
Process by which substances from an area of high concentration to an area of low concentration
Diffusion
The ability of a molecule to go though a membrane depends on..(3)
- size
- type(polar,nonpolar)
- molecule structure of the embrace
There is no net movement when there is
Equilibrium
Equilibrium is when
It is the same percentage of everything in and out of the cell
Concentration gradient
Difference in concentration of the substances
What is concentration gradient separated by
A membrane
The movement of water from an area of high concentration to lower concentration
Osmosis
What type of molecules does osmosis occur with
Water
Hypotonic
Outside cell-
Inside cell-
Effect on cell-
Low solute, high solvent
High solvent, low solute
Cell swells
Hypertonic
Outside cell-
Inside cell-
Effect on cell-
High solute, low solvent
Low solute, high solvent
Cell shrinks
Isotonic
Outside cell-
Inside cell-
Effect on cell-
Same
Same
Same
Specialized structures that remove excess water
Contractile vacuoles
When the animal swells or burst
Cytolysis
What does the cell wall do during osmosis
Become rigid due to turgor pressure, holds cell membrane
Function of cell membrane in osmosis
If it shrinks and detached from the cell wall, the cell will die; when filled with water, turgor pressure will develop
Plant cells need turgor pressure because
Without it the cell will shrink and die
Plasmolysis
When a plant cell shrinks then dies
Transport proteins that aloe ions to pass through the cell membrane
Ion channels
Ion channels are either
Open or closed