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Cellular Transport

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Cellular Transport The movement of materials in and out of cells Ch 8 Cellular Transport What substances move ? How do they move? What is the membrane structure? – PowerPoint PPT presentation

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Title: Cellular Transport


1
Cellular Transport
  • The movement of materials in and out of cells
  • Ch 8

2
Cellular Transport
  • What substances move ?
  • How do they move?
  • What is the membrane structure?
  • What is passive versus active transport?

3
Solution Concentration
  • Like density
  • molecules per
  • volume of container
  • Low or High Concentration



High Conc.

Low Conc.
4
Diffusion
  • Movement of molecules
  • gas or liquid
  • Law of Diffusion
  • From High Concentration to
  • Low Concentration

5
Diffusion of gases.
O2 High
CO2
CO2 High
6
Cell Membrane
  • Surrounds cells
  • Gives shape to animal cells
  • Inside cell wall of plant cells

7
Cell Membrane
  • Made of
  • Lipid layer
  • Protein channels
  • Semi-permeable

8
Cell Membrane
9
Semi-permeable
  • Semi some substances may pass
  • Selective
  • Based upon size solubility

H20 flows
Salt remains
10
Osmosis
  • Movement of water
  • Across a semi-permeable membrane
  • Special case of diffusion

11
Equilibrium
H2O H2O H2O H2O H2O H2O H2O
H2O H2O
  • Equi Equal concentrations
  • On both sides of membrane
  • Osmosis stops
  • Isotonic Solution

12
In Osmosis.only H2O moves
  • Therefore focus on the water concentration
  • 1 Salt solution
  • Water is
  • High concentration
  • Salt is Low
  • 10 Salt Solution
  • Water is
  • Low
  • concentration
  • Salt is High

13
Osmosis in cells
  • 10 salt solution
  • -H20
  • NaCl

1 salt solution H20 -NaCl
H20
H20
Water flows from High to Low Concentration
14
Active or Passive Transport?
  • Which requires ATP energy?
  • Which goes with the concentration gradient?
  • Which goes against the gradient?

15
Concentration Gradient


16
Passive Transport
  • Diffusion or Osmosis
  • Going with the gradient
  • No ATP energy required

High Conc. To Low Conc.



17
Active Transport
  • Against the gradient
  • Requires ATP
  • Low to High Concentrations
  • Salt returning to blood in kidneys




18
Plasmolysis
  • Cell membranes shrink or expand
  • Dependent on salt concen-trations

19
Hypotonic or Hypertonic Solutions?
Tap Water
  • Hypotonic under or low salt outside, relative
    to cell
  • Hypertonic over or high salt relative to cell

Salt water inside cell
20
Sea water organism in fresh water.
Tap Water
  • Hypotonic Solution
  • Low salt concentration outside the cell
  • High Water concentration outside
  • Water moves?
  • Inside
  • Cell Bursts!
  • Salt Water
  • Inside Cell
  • Low Water

H20
21
Fresh water organismin salt water.
  • Hypertonic Solution
  • Water moves?
  • Out of the cell
  • Cell shrinks
  • Salt Water
  • High salt
  • Low water
  • Fresh water
  • Inside cell
  • High Water

H20
22
Plants cells bulge, not burst!
Or Cell Membranes Shrink
23
Paramecium have water pumps!(called contractile
vacuoles)
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