Download - Perspective If a Hydrogen atom were the size of a penny A penny would be the size of the moon!
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Perspective• If a Hydrogen atom
were the size of a penny
A penny would be the size of the moon!
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Cells, Transport and Homeostasis
How cells get what they need (and not what they don’t need).
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Diffusion•How could/can you smell the fish tank (when it’s
yucky) from where you sit?•Diffusion• particles moving from an area of higher
concentration to an area of lower concentration•WHY do molecules diffuse? THINK about it.
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Diffusion•How could/can you smell the fish tank (when it’s
yucky) from where you sit?•Diffusion• particles moving from an area of higher
concentration to an area of lower concentration•WHY do molecules diffuse? THINK about it.•What factors would influence the rate of diffusion?
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Diffusion•When do the molecules stop moving? Think about
it!•Why is no additional energy needed for diffusion?• Is diffusion good for cells? Explain.
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Diffusion•Almost any molecule will diffuse across a cell
membrane… given enough time• Small molecules diffuse faster•O2, CO2
•Water, but it takes a little longer
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Diffusion•How could you make it work better?• Facilitated Diffusion –• Particles diffusing across a membrane through
specific transmembrane proteins.
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Facilitated Diffusion
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Facilitated Diffusion• Ions and molecules moving across the membrane
via transmembrane proteins•Channels and carrier proteins•Channels allow things through (not much control). •Carrier proteins move things through (more
control).
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Gated Channel = Carrier
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Facilitated Diffusion•Diffusion and Facilitated Diffusion are both passive
transport…•Movement of particles across a cell membrane
without the need of additional energy
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And within your lifetime…
Aquaporin
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Aquaporin•Make a prediction about an aquaporin’s structure/makeup
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Aquaporin•Make a prediction about an aquaporin’s structure/makeup
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Diffusion vs Osmosis•What is the difference between diffusion and
osmosis?•How does osmosis happen?
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Homework• Provide three examples of particles that need to be
moved in to/out of a cell