Lab 4: Osmosis and Diffusion Flashcards
What factors determine how fast water moves across a membrane?
Hydrostatic pressure
and
Solute concentration difference
Plant cells are like red blood cells and can potentially burst when placed in solutions of varying tonicity.
true or false
false
Which molecules can diffuse through a cell membrane?
small molecules
Moving molecules against their concentration gradient requires what?
energy
diffusion does or doesn’t require energy input
doesn’t
What will happen when a red blood cell is placed in distilled water?
lysis will occur
The movement of water molecules from a region of high free water concentration to a region of low free water concentration is known as ____________________
osmosis
Tonicity is the measure of what
osmotic pressure
The difference between dialysis tubing and real cell membranes is that
real membranes are more selective
What will happen when a red blood cell is placed in a hypertonic solution?
The cell becomes shriveled
is the movement of solutes through semipermeable membrane.
diffusion
what direction do molecules go during diffusion
from high concentration to low concentration
The difference in concentrations between adjoining regions is called a
concentration gradient
moving against the concentration requires what
input of energy
is the passive movement of water through a semipermeable membrane
osmosis
how does water flow through osmosis
low solute concentration to high solute concentration
in areas where there is little or no nondiffusible solute, most of the water molecules are
free and able to diffuse
the measure of osmotic pressure
tonicity
the pressure that exerted from the relative concentration of solution
tonicity
areas of high solute concentration are what?
hypertonic
areas of low solute concentration are what?
hypotonic
situations that have the same solution concentrations within the cell and it’s surrounding environment are what
isotonic
if you place a red blood cell in a hypertonic solution
the water would move put of the red blood cell and cause it to shrink
What kind of solution is this?
Hypotonic
What kind of solution is this?
Hypertonic
What kind of solution is this?
Isotonic
If you drop a red blood cell in a hypotonic solution what will happen
the cell will burst
what does it mean to lyse
burst
factors that determine how much/how
fast water flows across a membrane.
difference in solute concentration across the membrane.
and
the hydrostatic pressure on the membrane.
the greater the difference in solute concentration the what the water will cross the membrane
faster
the water pressure created as water moves into or
out of the cell.
hydrostatic pressure
when plant cells are put in a hypotonic solutuon what happens
they become turgid
when plant cells are put in a hypertonic solution what happens
the become flaccid
