Transport of Molecules. concentration Where is there a higher concentration of yellow dots? AB.

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.

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

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

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???

Remember, they have a CELL WALL

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

ISOTONIC

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]

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

Transport of Molecules. concentration Where is there a higher concentration of yellow dots? AB.

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