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

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Presentation transcript:

Transport of Molecules

concentration Where is there a higher concentration of yellow dots? AB

Tendency for molecules to move from an area of high concentration to an area of low concentration. AB 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

SOLUTE SOLUTE SOLVENT SOLVENT DIFFUSION through a semi-permeable membrane particle that dissolves substance in which another substance is dissolved

Tendency for an area of high concentration an area of low concentration to move from an area of high concentration to a an area of low concentration solution DIFFUSION through a semipermeable membrane molecules

IODINE + STARCH -> PURPLE

Tendency for hypertonic hypotonic to move from hypertonic solution to a hypotonic solution DIFFUSION through a semipermeable membrane molecules

Hypertonic = HIGH solute concentration compared to “X” side Hypotonic = 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 WATER

hypotonic hypertonic Tendency for WATER MOLECULES to move from hypotonic solution to a hypertonic solution osmosis

DIFFUSION OSMOSIS

passive transport think of passive 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? OSMOSIS???

What happens in plant cells? Remember, they have a CELL WALL

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? 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 H 2 O CELL WALL CELL MEMBRAN E

ISOTONIC 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 PASSIVE!!

Endocytosis Endocytosis {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…

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