Chapter 7-3
description
Transcript of Chapter 7-3
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Chapter 7-3
The Cell Membrane; Active & Passive Transport
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The Cell Membrane
●Gatekeeper
●Regulates what comes in and out
of the cell
●Main components: proteins and
phospholipids
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Cell Wall●Found only in plant cells and bacteria
cells
●Main function is support
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Solutions
●Mixtures of substances
●Ex. Salt + water; sugar + water
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Diffusion
●The movement of molecules from
an area of high concentration to an
area of low concentration
●Molecules tend to “spread out”
●Requires no energy
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EquilibriumWhen molecules are evenly spread
throughout a space
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Osmosis●The diffusion of water
across a membrane●The cell membrane is
selectively permeable
●Watch the animation
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Rule for Osmosis
If the area outside the cell has more salt
– then water will be sucked out of the
cell
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U - Tubes
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Cells In Different Solutions
"ISO" means the same
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Hypo = less Cell may burst,
or organelles
called
“contractile
vacuoles”
remove excess
water
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Hyper = more Cell will shrink or die,
plants wilt
Why is it dangerous
to drink sea water?
Why does pouring
salt on a slug kill it?
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Passive Transport●Requires no energy●Diffusion & Osmosis●Facilitated Diffusion – carrier
proteins “help” molecules across the membrane
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1. Why is the water moving toward the left side of the beaker?
2. Which side of the beaker is hypertonic?
3. What is the solute?
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WORD LIST●Diffusion●Osmosis●Selectively permeable●Equilibrium●Solution●Facilitated Diffusion●Hypertonic●Hypotonic●Isotonic●Contractile Vacuole●Passive Transport
Know all of these
words for the test
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ACTIVE TRANSPORT
●Requires the cell to use energy
●Proteins or Pumps found in the
membrane move materials across
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Endocytosis
●Taking “in” large molecules by the cell
●Phagocytosis = “phood”, taking in food
particles
●Pinocytosis = liquid substances
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EXOCYTOSISRemoving large particles (waste) from the cell
Stuff “exits” the cell
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Add to Word List
●Active Transport
●Endocytosis
●Phagocytosis
●Pinocytosis
●Exocytosis
●Protein Pump