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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
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7.4 READING Q’s
MAIN IDEA:-cellular transport moves substances in and out of a cell
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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
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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
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7.4 READING Q’s5-IDENTIFY the cell structure through which substances
pass as they leave the cell during exocytosis.
-PLASMA MEMBRANE
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COOPERATIVE GROUP: GUIDED NOTES
-As a GROUP complete the guided note using your knowledge from the reading.
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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
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Movement across the Cell Membrane
7.4 CELLULAR TRANSPORT
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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
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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
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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
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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--
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MODEL diffusion
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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
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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
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WATER can diffuse across the plasma membrane
movement of water
OSMOSIS: DIFFUSION OF WATER
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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:
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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
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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
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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
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CLASSIFY/SUMMARIZE the 5 ways particles move through the membrane.
TRANSPORT SUMMARY
NO ENERGY / HIGH LOW
ENERGY / LOW HIGH
/ osmosis
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PASSIVE TRANSPORTDIFFUSION/ OSMOSIS-high low concentration gradient
FACILITATED TRANSPORT-through a protein channel-high low concentration gradient
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-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
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ACTIVE TRANSPORTActive transport-diffusion against concentration gradient-low high-uses a protein pump-requires ENERGY ATP (adenosine triphosphate)
ATP
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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
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TRANSPORT SUMMARY
simplediffusion
facilitateddiffusion
activetransport
ATP
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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
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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