Lab 5
Diffusion Across Cell Membranes
Osmosis and Dialysis
MOVEMENT OF MOLECULES THROUGH CELL MEMBRANES
Allows cells to maintain homeostasis
Provides cells with materials for metabolism
Transports products of metabolism and waste
DIFFUSION
Movement of molecules from an area of high to low concentration
achieve equilibrium.
Diffusion Animation
(Java-enabled browers only)
ACTIVE TRANSPORT
Movement of molecules against a concentration gradient,
requiring energy.
OSMOSIS
Diffusion of water molecules through a selectively permeable
membrane.
SELECTIVELY PERMEABLE MEMBRANE
Allowing some materials to pass through more easily than
others.
SOLVENT
Liquid substance, such as water, in which other materials
may be dissolved.
SOLUTE
The dissolved substance in a solution.
SOLUTION
Solute plus solvent.
RED BLOOD CELLS IN:
Isotonic
Solution
Hypertonic
Solution
Hypotonic
Solution