Transport of Molecules
concentration
Where is there a higher concentration of yellow dots?A B
Tendency for molecules to move from an area of high concentration to an area of low concentration.
A B
DIFFUSION
Transport of Molecules
WHAT IS HAPPENING - EXPLAIN THIS TO THE PERSON SITTING NEXT TO YOU…
Tendency for molecules to move from an area of high concentration to an area of low concentration.
DIFFUSION
membranes act as filters.
DIFFUSION through a semi-permeable membrane
SOLUTESOLUTE
SOLVENTSOLVENT
DIFFUSION through a semi-permeable membrane
particle that dissolves
substance in which another substance is dissolved
Tendency for
to move from an an area of high area of high concentrationconcentration to a an area of low an area of low concentrationconcentration solution
DIFFUSION through a semipermeable membrane
moleculesmolecules
IODINE + STARCH ->
PURPLE
Tendency for
to move from hypertonichypertonic solution to a hypotonichypotonic solution
DIFFUSION through a semipermeable membrane
moleculesmolecules
Hypertonic = HIGH solute concentrationcompared to “X” sideHypotonic = low solute concentration compared to “X” side
outside
WE HAVE BEEN MOVING SOLUTE MOLECULES…..
What is
next?
Moving the SOLVENT
Tendency for
to move from ?????? solution to a ?????? solution
OSMOSIS through a semipermeable membrane
WATERWATER
Tendency for WATER MOLECULES to move from hypotonichypotonic solution to a hypertonichypertonic solution
osmosis
DIFFUSION
OSMOSIS
think of passive transportpassive transport like going down a slide…
think of facilitated diffusion like going down a slide… with help of proteins
going from HIGH to low requires no energy…
It just
goes!
Still PASSIVE…. What is different?
think of DIFFUSION like going down a slide…
Going from HIGH to low requires no energy…
What happens in plant cells?What happens in plant cells?
OSMOSIS???
What happens in plant cells?What happens in plant cells?
Remember, they have a CELL WALL
What happens in plant cells?What happens in plant cells?
the pressure of the cell contents against the cell wall, in plant cells, determined by the water content of the vacuole
What happens in plant cells?What happens in plant cells?
the pressure of the cell contents against the cell wall, in plant cells, determined by the water content of the vacuole
Osmosis in cells w/ walls
Isotonic is not good enough!
TURGID vs. FLACID
with salt w/ distilled H2O
CELL WALL
CELL MEMBRANE
CELL MEMBRANE
ISOTONIC
HY
HY
Red Blood Cells
pertonic inside the cell
potonic inside the cell
Are these words dealing with the CELL…. Or the
SOLUTION outside the cell?
NOT NOT PASSIVE!!PASSIVE!!
EndocytosisEndocytosis {Endo (within) cytosis (cell) } is a process in which a substance gains entry into a cell without passing through the cell membrane. This process is subdivided into three different types:
Active Transport = [low] to [high]
ATP
think of active transport like going up a slide…
think of active transport like going up a slide…
going from low to HIGH requires a lot of energy…
think of active transport like going up a slide…
going from low to HIGH requires a lot of energy…
phagocytosis
Phagocytosis-cell eating
pinocytosis-cell drinking
exocytosis-cell vomiting