2.8 Tonicity & Osmoregulation Flashcards
Hypertonic
Water leaving the cell, cell deflates.
- Cell becomes turgid (larger pressure)
*Crenation
Isotonic
Water in equilibrium.
- Cell becomes flaccid (limp)
Hypotonic
Water entering the cell, cell may burst
- Cytosis
- Higher solute concentration, less solvent.
Osmosis
Movement of water through a semi-permeable membrane.
What does lower water concentration mean?
High solute concentration
Where does water move?
Where there is higher solute concentration
What happens to blood cells if pure water is given through IV?
They will burst because blood cells contain solutes.
Osmolarity
Total solute concentration in a solution
Tonicity
The measurement of the relative concentration of solute inside & outside the cell.
What movement of water occurs in an isotonic environment?
No net movement; isotonic environment is in equilibrium.
Solutes diffuse from a hypertonic environment to
A hypotonic environment.
What do cells undergo to maintain less cellular solute and more cellular water?
Plasmolysis and environmental hypertonicity.
