diffusion & osmosis ch 8. diffusion definition: net movement of particles from an area of...
TRANSCRIPT
Diffusion & Osmosis
Ch 8
Diffusion Definition: Net movement of particles from an
area of _______ concentration to an area of ______ concentration
Example: _____________________________
highhighlowlow
The smell of popcorn traveling The smell of popcorn traveling across the room across the room
Diffusion results from the _________ movements of particles (Brownian motion)
Diffusion is a ________ process
randomrandom
SLOWSLOW
3 factors affect the ________ (how
quickly or slowly) of diffusion
________________ If you increase ________ then ______________________
________________ If you increase ________ then __________________________
________________ If you increase ________ then _______________________
raterate
TemperatureTemperature
ConcentrationConcentration
PressurePressure
TempTemp..it will move more it will move more
ConcConc..it will diffuse more rapidlyit will diffuse more rapidly
PressurePressureit will increase diffusionit will increase diffusion
Eventually… the particles will become _______ distributed
The condition in which there is continuous movement, but no overall concentration change is called __________________
evenlyevenly
dynamic equilibriumdynamic equilibrium
The difference in concentration of a substance across a space is called _______________________concentration gradientconcentration gradient
High concentration
Low concentration
concentration gradient
concentration gradient
In the case with diffusion, particles are moving from an area of _____ concentration to an area of _____ concentration; therefore, the substance is said to move ______ the concentration gradient.
highhighlowlow
withwith
Another example of diffusion: Oxygen in the air sacs of lungs
diffuses into capillariesParticles constantly move & bounce off
each other and other surfaces
Osmosis Definition: Diffusion of water across a
_________________ membrane
Osmosis is a special example of __________
Semi-permeableSemi-permeable
diffusiondiffusion
Osmosis Example: Absorption of water by plant roots
Osmosis
It is important to notice that __________________ molecules do not cross the membrane, but _______ molecules do cross during osmosis
Osmosis occurs in both plant and animal cells and there are three conditions that typically appear.
large impermeablelarge impermeableHH2200
Isotonic Solution Concentration of dissolved substances in the
solution is the _______ as the concentration of dissolved substances inside the cell.
Hypotonic solution Concentration of dissolved substances is
_______ in the solution outside the cell than the concentration inside the cell
Hypertonic solution Concentration of dissolved substances is
________ outside than the concentration inside the cell
samesame
lessless
greatergreater
ISOTONIC SOLUTION
10% salt
10% salt
cell
HYPOTONIC SOLUTION
2% salt
10% salt
cell
HYPERTONIC SOLUTION
25% salt
10% salt
cell
Normal Cells in Isotonic Solution
Cells in Hypertonic Solution
Cells in Hypotonic Solution
ISOTONIC SOLUTION
10% salt
10% salt
cell
HYPOTONIC SOLUTION
2% salt
10% salt
cell
HYPERTONIC SOLUTION
25% salt
10% salt
cell
Equal movement in
and out
More H2O in than out
More H2O out than in
Here is what happens when more water exits or more water enters