Transcript Passive Vs. Active Transport

Passive Vs. Active Transport
in Cells
What is passive transport?
• Questions: What part of a cell allows things like sugar,
water, and salt in and out of its environment.
• Cell Membrane
• Passive Transport: The movement of substances
through the cell membrane without the input of energy
(force).
• Acts like a screen door: Air is allowed in, yet bugs are not.
• Small particles do not require force.
What is diffusion?
• What takes place in your body when a coach ask you to
“warm up”?
• The oxygen you are taking in is being passed to all the cells in your
body.
• What allows this process to take place?
• Diffusion: A type of passive transport where molecules move from
an area where there is relatively more of them to an area where
there is relatively less.
• Diffusion will stop when equilibrium is reached.
• Why do you pull muscles when you don’t warm-up?
• The muscle that you hurt did not receive enough oxygen filled cells.
How does temperature effect
diffusion?
• Mini-lab
– Conclusion: Heat increases the rate of diffusion.
What is osmosis?
• Osmosis: The diffusion of water through a cell
membrane.
• Water will leave a cell when there is not the same amount of water
inside and outside the cell.
• When plant cells loose water the cell membrane pulls away from the
cell wall.
– Why do plants become limp in the summer time?
What is active transport?
• Active Transport: When an input of energy is required to
move materials through a cell membrane.
– How do plant roots get their nutrients?
• Transport protein pulls the nutrient through the cell membrane.
Diffusion/Osmosis Interactive Lab
• http://mw.concord.org/modeler1.3/mirror/c
hemistry/diffusion.html
EOG Test Prep
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Passive vs. Active Transport Review: http://glencoe.mcgrawhill.com/sites/0078617898/student_view0/unit5/chapter17/section_2_self-check_quizeng_.html
Cell Process EOG Questions: http://glencoe.mcgrawhill.com/sites/0078617898/student_view0/unit5/chapter17/standardized_test_practice.
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