5 14 passive transport is diffusion across a membrane n.
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5.14 Passive transport is diffusion across a membrane - PowerPoint PPT Presentation


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Diffusion is the tendency for particles to move from an area of high concentration to an area of low concentration. Concentration gradient is the difference in concentration on two sides of a membrane Passive transport – no energy required by the cell for this to happen O 2 , CO 2.

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5 14 passive transport is diffusion across a membrane
Diffusion is the tendency for particles to move from an area of high concentration to an area of low concentration.

Concentration gradient is the difference in concentration on two sides of a membrane

Passive transport – no energy required by the cell for this to happen

O2, CO2

5.14 Passive transport is diffusion across a membrane

High Low

Concentration gradient

http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_diffusion_works.html

5 15 transport protein may facilitate diffusion across membrane
5.15 Transport protein may facilitate diffusion across membrane
  • Facilitated Diffusion
    • molecules that are too large or that are charged move down their concentration gradient (high to low) through protein channels or carriers.
  • Passive transport
    • down its conc. gradient
  • Each molecule has a particular protein channel that it is designed to bind with

http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_facilitated_diffusion_works.html

5 16 osmosis is the diffusion of water across a membrane
5.16 Osmosis is the diffusion of water across a membrane
  • Water is one of the most important substances to move across a membrane
  • Osmosis
    • Diffusion of water. Movement from high to low concentrations.
  • Passive transport
    • down its conc. gradient

http://www.stolaf.edu/people/giannini/flashanimat/transport/osmosis.swf

http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works.html

5 16 osmosis
5.16 Osmosis

Water molecules

Higher Concentration

of Water

Cell

membrane

Lower Concentration

of Water

Sugar molecules

http://www.stolaf.edu/people/giannini/flashanimat/transport/osmosis.swf

5 17 water balance between cells and their surroundings is crucial to organisms
5.17 Water balance between cells and their surroundings is crucial to organisms.

Isotonic – the solution outside the cell is equal to the solution of the cytoplasm. Iso means the same.

Water will move equally in both directions.

No net movement across cell membrane.

Isotonic solution

5 17 water balance between cells and their surroundings is crucial to organisms1
5.17 Water balance between cells and their surroundings is crucial to organisms.

Hypertonic – the solution outside the bag is “hyper” meaning it is above strength. Hyper means high so the solution is high in solute, low in water.

Water will move in both directions but more will move to an area of low concentration. This will cause the cell to lose water.

Just like your potato in salt water.

Hypertonic solution

More solute = less water

5 17 water balance between cells and their surroundings is crucial to organisms2
5.17 Water balance between cells and their surroundings is crucial to organisms.

Hypotonic – the solution outside the bag is “hypo” meaning below strength. Hypo means below so the solution is low in solute and high in water.

Water will move in both directions but more will move inside the cell.

Hypotonic solution

slide8

http://www.stolaf.edu/people/giannini/flashanimat/transport/osmosis.swfhttp://www.stolaf.edu/people/giannini/flashanimat/transport/osmosis.swf