7.4 CELLULAR TRANSPORT

WHAT YOU WILL LEARN-process of diffusion, facilitated diffusion, and active transport-effect of hypotonic, hypertonic, and isotonic solutions on a cell-how large particles enter and exit the cell

7.4 READING Q’s

MAIN IDEA:-cellular transport moves substances in and out of a cell

7.4 READING Q’s1-EXPLAIN the basic function of the transport protein

in facilitated diffusion.-molecules pass through the transport protein to MOVE from area of HIGH concentration to area of LOW concentration

2-DEFINE the meaning of each root word-

-ISO: _______________

-HYPER: _______________

-HYPO: _______________

 

MORE / HIGH

LESS / LOW

EQUAL / SAME

7.4 READING Q’s3-EXPLAIN

why is the cell at equilibrium in an isotonic solution?

 -concentration in its cytoplasm is the same as the

concentration in the outside environment.

4-ANALYZE

why does water move into a cell placed in a hypotonic

solution?

-There is MORE water OUTSIDE a cell than inside

7.4 READING Q’s5-IDENTIFY the cell structure through which substances

pass as they leave the cell during exocytosis.

-PLASMA MEMBRANE

COOPERATIVE GROUP: GUIDED NOTES

-As a GROUP complete the guided note using your knowledge from the reading.

COOPERATIVE LEARNINGLAB GROUP(3-5 students)-working TOGETHER as a cooperative group to COMPLETE TASK-EVERY TEAM MEMBER has a job and participates EQUALLY

1-READ THROUGH EACH TASK (silently or together)2-DISCUSS (use POSITIVE communication)

3-ANSWER AND MARK THE TEXT4-MOVE ON (only when ALL team members understand)

QUESTIONS ?’s -each other CLARIFICATION-Asking Mrs. Paepke for clarification NOT answers.FYI-discussion within COLORED group ONLY

Movement across the Cell Membrane

7.4 CELLULAR TRANSPORT

WRITE the correct vocabulary term in the left column for each definition below:

1-process by which plasma membrane surrounds a substance outside the cell - moves it inside the cell

-____________________2-movement of substances from a region of lower concentration to a region of higher concentration

-_____________________3-net movement of particles from an area where there are many particles to an area of few particles

-_____________________

VOCABULARY

ENDOCYTOSIS

ACTIVE TRANSPORT

DIFFUSION

4-process by which plasma membrane surrounds a substance inside the cell - moves it outside the cell

-_____________________5-diffusion of water across a selectively permeable membrane

-_____________________6-transport that uses transport proteins to move ions & small molecules across the plasma membrane

-_____________________7-condition in which there is continuous movement but no overall change in concentration

-_____________________

VOCABULARY

EXOCYTOSIS

OSMOSIS

FACILITATED DIFFUSION

DYNAMIC EQUALIBRIUM

DIFFUSION

movement from high low concentration movement from high low concentration

-net movement of particles from area where there are MANY particles of substance to area where there are FEWER particles of the substances

DIFFUSION

-particles of solids, liquids, gases in constant motion-random motion where particles move to areas that are less crowded (less concentrated)-HIGH concentration LOW concentration

-like flowing DOWNHILL /requires NO ENERGYREPHRASE the process of diffusion in your own words-

-

PROVIDE an example of diffusion--

MODEL diffusion

EXPLAIN: rate of diffusion-how fast or slow particles diffuse—moveLIST 3 characteristics that affect the rate of diffusion [in boxes below]CIRCLE the arrow that shows if the rate speeds up / slows down:concentration

temperature

pressure

DIFFUSION

DIFFUSION across plasma membraneMOST molecules cannot diffuse across membrane

-FACILITATED DIFFUSION-use TRANSPORT PROTEINS

CHANNEL proteins-open & close to allow substances to diffuse

across plasma membraneCARRIER proteins

-change shape to help move particles thru plasma membrane

WATER can diffuse across the plasma membrane

movement of water

OSMOSIS: DIFFUSION OF WATER

OSMOSIS: DIFFUSION OF WATER

DESCRIPTION ISO HYPOHYPE

R1-solution that has the same osmotic concentration as a cell’s cytoplasm

     

2-solution that causes a cell to shrivel      3-solution that causes a cell to swell      4-solution that neither shrinks nor swells a cell      5-solution in which there is more water outside the cell than inside the cell

     

6-solution that causes water to move out of a cell      

COMPLETE the table by checking the correct columns for each description:

Cell SWELLS when placed in

HYPOTONIC solution

Cell shows NO CHANGE when

placed in ISOTONIC solution

Cell SHRIVELS when placed in

HYPERTONIC solution

OSMOSIS: managing water balance

Cell survival depends on balancing water uptake & loss

EXPLAIN dynamic equilibrium & how it relates to the movement of water in & out of cells:

concentration balances movement continues = equal in both directions

= NO overall change

OSMOSIS: DIFFUSION OF WATER

SUMMARIZE the relationship between water & the plasma membrane by completing the concept chart

OSMOSIS: DIFFUSION OF WATER

Water moves IN & OUT of

the cell

Water flows from HIGH to

LOW concentration

HOMEOSTASIS is regulation of cell’s

internal environment

Flow of water helps CREATE & MAINTAIN

homeostasisOSMOSIS is

diffusion of water across plasma

membrane

CLASSIFY/SUMMARIZE the 5 ways particles move through the membrane.

TRANSPORT SUMMARY

NO ENERGY / HIGH LOW

ENERGY / LOW HIGH

/ osmosis

PASSIVE TRANSPORTDIFFUSION/ OSMOSIS-high low concentration gradient

FACILITATED TRANSPORT-through a protein channel-high low concentration gradient

-Diffusion through PROTEIN CHANNELS-channels move specific molecules across cell membrane-NO ENERGY needed

“The Bouncer”“The Bouncer”

open channel = fast transport

facilitated = with help

high

low

FACILITATED DIFFUSION

ACTIVE TRANSPORTActive transport-diffusion against concentration gradient-low high-uses a protein pump-requires ENERGY ATP (adenosine triphosphate)

ATP

ACTIVE TRANSPORT

“The Doorman”“The Doorman”

-Cells may need to move molecules against concentration gradient-shape change transports solute from one side of membrane to other

-protein “pump”-“costs” energy = ATP

ATP

low

high

Cell Membrane, Active Transport Video DnaTube.com - Scientific Video Site.wmv

TRANSPORT SUMMARY

simplediffusion

facilitateddiffusion

activetransport

ATP

ENDOCYTOSIS/EXOCYTOSIS

ENDOCYTOSIS:cell engulfs materials with a portion of cell’s membrane & releases the contents into cellrequires ENERGYFOOD MOLECULES

EXOCYTOSIS:membrane surrounds materials in cell, attaches to membrane, expels material to surrounding environmentrequires ENERGYWASTE PRODUCTS

ATP ATP

CONNECT1-diffusion

-walking through entryway with streamers2-facilitated diffusion

-taking escalator3-active transport

-entering subway gate with ticket4-exocytosis

-taking out garbage5-endocytosis

-receiving shipping