BIOLOGY

Unit 2 Notes:
Cell
Membrane
Transport
(1) Cell Membrane Transport
• Why Do Cells Do This?
Cells need to move useful nutrients /
molecules in and out of the cell...
(2) Diffusion
• Movement of particles from high to low
concentration, across a concentration
gradient, until reaching equi...
(3) Facilitated Diffusion
• The assisted movement of large molecules
across protein channels, from high to low
concentrati...
(4) Osmosis
• The diffusion of water.
• The movement of water molecules from
high to low concentration, across a
gradient,...
(5) Osmotic Environments
• Isotonic:
Equal amounts of water
inside and outside the
cell.

-PICTURE-

• Hypertonic:
Higher ...
(6) Active Transport
• The forced movement of particles, AGAINST
a gradient, from low to high concentration.
• Requires th...
Biology unit 2 cells cell membrane transport notes
Biology unit 2 cells cell membrane transport notes
Biology unit 2 cells cell membrane transport notes
Biology unit 2 cells cell membrane transport notes
Biology unit 2 cells cell membrane transport notes
Biology unit 2 cells cell membrane transport notes
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Biology unit 2 cells cell membrane transport notes

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Biology unit 2 cells cell membrane transport notes

  1. 1. BIOLOGY Unit 2 Notes: Cell Membrane Transport
  2. 2. (1) Cell Membrane Transport • Why Do Cells Do This? Cells need to move useful nutrients / molecules in and out of the cell . • Types: – Diffusion – Facilitated Diffusion – Osmosis – Active Transport
  3. 3. (2) Diffusion • Movement of particles from high to low concentration, across a concentration gradient, until reaching equilibrium. • Does NOT require any energy (or ATP). • Picture:
  4. 4. (3) Facilitated Diffusion • The assisted movement of large molecules across protein channels, from high to low concentration, until reaching equilibrium. • Does NOT require any energy (or ATP). • Picture:
  5. 5. (4) Osmosis • The diffusion of water. • The movement of water molecules from high to low concentration, across a gradient, until reaching equilibrium. • Does NOT require any energy (or ATP). • Picture:
  6. 6. (5) Osmotic Environments • Isotonic: Equal amounts of water inside and outside the cell. -PICTURE- • Hypertonic: Higher concentration of water inside the cell, than outside. -PICTURE- • Hypotonic: Lower concentration of water inside the cell, than outside. -PICTURE-
  7. 7. (6) Active Transport • The forced movement of particles, AGAINST a gradient, from low to high concentration. • Requires the use of energy (or ATP). • Picture:

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