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Cell Membrane

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Cell Membrane Cell Membrane Phospholipid bilayer--two layers of phospholipid sheets. Phospholipids polar head --hydrophilic (water loving) non-polar--hydrophobic tail ... – PowerPoint PPT presentation

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Title: Cell Membrane


1
Cell Membrane
2
Cell Membrane
  • Phospholipid bilayer--two layers of phospholipid
    sheets.
  • Phospholipids
  • polar head --hydrophilic (water loving)
  • non-polar--hydrophobic tail
  • Like a bubble made of floating buoys.

3
Fluid Mosaic
  • The membrane is permeable
  • Protein and carbohydrates embedded in membrane
  • Proteins act as receptors
  • Carbohydrates can be cell identification tag.

4
Traversing the cell membrane
  • Pair and share
  • What substances must get into or out of the cell?
  • Some possible answers carbon compounds (protein,
    carb, lipid), waste, oxygen, CO2, salts,
    minerals, water

5
Diffusion
  • Solutes move from high concentration to low
    concentration, until they reach equilibrium.

6
OSMOSIS
  • Special type of diffusion
  • Water moves toward salt (solute)
  • Diffusion of water through a selectively
    permeable membrane.
  • What would happen to the water in cells if the
    blood becomes dehydrated (more salty)?

7
How substances traverse the membrane
Osmosis
8
  • ANIMATIONS OF ALL PROCESSES
  • Membrane Transport Graphic Organizer

9
BULK TRANSPORT
  • EXOCYTOSIS/ ENDOCYTOSIS
  • COOLEST ANIMATION EVER
  • WHAT CELL PARTS DO YOU NOTICE?
  • COOL ANIMATION
  • http//www.mhhe.com/biosci/genbio/espv2/data/cells
    /003/index.html
  • CLICK ON 1.80 EXO/ENDOCYTOSIS

10
Tonicity
  • These terms are always used in comparison
  • Draw a representation of each
  • Isotonic solution
  • Hypertonic solution
  • Hypotonic solution

11
Figure 7.14
Lowerconcentrationof solute (sugar)
Higher concentrationof solute
Same concentrationof solute
Sugarmolecule
H2O
Selectivelypermeablemembrane
Osmosis
12
Work it Out
  • What would happen to a blood cell in
  • Blood Plasma?
  • Pure water?
  • Highly Saline (salty) solution?

13
Figure 7.15
Isotonicsolution
Hypertonicsolution
Hypotonicsolution
(a) Animal cell
H2O
H2O
H2O
H2O
Lysed
Normal
Shriveled
Cell wall
H2O
H2O
H2O
H2O
(b) Plant cell
Turgid (normal)
Flaccid
Plasmolyzed
Osmosis
14
Work it Out
  • What would happen to a blood cell in
  • Blood? Stays the same
  • Pure water? Swells and bursts (lyse)
  • Salt water? Shrinks --water leaves (crenate)

15
Watch the Process
  • See animations on Memory Stick
  • Diffusion
  • Osmosis
  • Cell Transport
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