diffusion unit class 1
TRANSCRIPT
DiffusionThe spread of particles through random
motions from regions of higher concentrations to regions of lower
concentrations
Simple DiffusionRequires NO energy
Molecules move from areas of HIGH to Low concentration
DiffusionDiffusion is a PASSIVE process which means no energy is used to make the molecule move, they have a natural KINETIC ENERGY
Diffusion of Liquids
When the molecules are even throughout a space - it is called EQUILIBRIUM
Concentration gradient - a difference between concentrations in a space.Molecules will always move down the concentration gradient, toward areas of lesser concentration.
Think of food coloring that spreads out in a glass of water, or air freshener sprayed in a room.
Diffusion through a MembraneSolute moves DOWN concentration gradient (HIGH to LOW)
How Diffusion Workshttp://highered.mcgraw-hill.com/sites/
0072495855/student_view0/chapter2/animation__how_diffusion_works.html
Turn to your partner and discuss different examples
of diffusion in your everyday life.
Some major examples of diffusion in biology: Gas exchange at
the alveoli — oxygen from air to blood, carbon dioxide from blood to air.
Diffusion in Photosynthesis
Gas exchange for photosynthesis — carbon dioxide from air to leaf, oxygen from leaf to air.
Diffusion in Respiration
Gas exchange for respiration — oxygen from blood to tissue cells, carbon dioxide in opposite direction.
Diffusion in Transfer of Transmitter Substance
Transfer of transmitter substance — acetylcholine from presynaptic to postsynaptic membrane at a synapse.
Diffusion of Water- Osmosis
Osmosis — diffusion of water through a semipermeable membrane.
http://www.youtube.com/watch?v=sdiJtDRJQEc
JournalsDefine the following terms in your own
words:-diffusion-equilibrium-osmosis