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Crossing Membranes Passive Processes Presentation Transcript

Slide 1 - Crossing Membranes 1 – Passive Processes Book Reference: p.22-23
Slide 2 - Diffusion The After Shave Man
Slide 3 - Diffusion in Air
Slide 4 - Diffusion in water
Slide 5 - What is diffusion? (definition) Diffusion is the movement of molecules (or ions) from a region of high concentration to a region of lower concentration until they are spread out evenly
Slide 6 - Example 1:Diffusion in the Alveoli: O2 diffusing into the blood and CO2 diffusing out of the blood
Slide 7 - Example 2: Some digested food diffuses across the gut wall into the blood
Slide 8 - What affects the rate of diffusion? Concentration gradient: The greater the difference in the concentration of a substance in two areas, the faster the rate of diffusion The rate of diffusion is directly proportional to the concentration gradient
Slide 9 - What affects the rate of diffusion?
Slide 10 - Small particles tend to diffuse faster than larger ones
Slide 11 - Diffusion takes place more quickly through thin membranes (e.g. exchange of gases through the alveolar wall)
Slide 12 - The larger the surface area the higher the rate of diffusion (e.g. in gases diffusing into/out of leaves)
Slide 13 - The shorter the distance, the faster the rate of diffusion An increase in temperature increases the rate of diffusion
Slide 14 - Facilitated Diffusion Faster movement Cell membrane proteins used Channel proteins Carrier proteins
Slide 15 - Channel Proteins facilitate the diffusion of Ions Na+ K+ Ca2+ Cl- Why can ions not diffuse freely across the membrane? Usually each channel protein is specific to one type of ion
Slide 16 - Channel proteins can open or close their pores acting like gates depending upon the cell’s needs
Slide 17 - Carrier proteins are more sophisticated in the way they work They allow the diffusion across the membrane of larger polar molecules, such as sugars and amino acids
Slide 18 - Once a particular molecule attaches to the carrier protein at it binding site, the carrier protein changes its shape to ‘deliver’ the molecule through the membrane
Slide 19 - This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com Is home to well over a thousand powerpoints submitted by teachers. This a free site. Please visit and I hope it will help in your teaching
 

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