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Chapter 4 Section 1

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Explain the process of diffusion

Describe how osmosis occurs

Compare passive transport with activetransport

Explain how large particles get into and outof cells

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Obtain energy & raw materials

Get rid of wastes

Divide (grow & repair injuries)

*Exchange with the environment takes place at

the cell membraneMovement into and out of the cell

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Movement from an area ofhigh concentrationto an area oflow concentration

Particles move from where they are crowdedto where they are less crowded

Cells do not need energy for diffusion

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http://www.indiana.edu/~phys215/lecture/lecnotes/lecgraphics/diffusion2.gif

http://upload.wikimedia.org/wikipedia/commons/e/eb/Diffusion.gif

http://www.indiana.edu/~phys215/lecture/lecnotes/lecgraphics/diffusion2.gifhttp://upload.wikimedia.org/wikipedia/commons/e/eb/Diffusion.gifhttp://upload.wikimedia.org/wikipedia/commons/e/eb/Diffusion.gifhttp://www.indiana.edu/~phys215/lecture/lecnotes/lecgraphics/diffusion2.gif

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Cells are surrounded by and filled with fluids

Diffusion of water = Osmosis

Water molecules move through asemipermeablemembrane

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https://www.msu.edu/~knickerk/webquest/osmosis2.gif

https://www.msu.edu/~knickerk/webquest/osmosis2.gifhttps://www.msu.edu/~knickerk/webquest/osmosis2.gif

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Small particles cross the membrane throughpassageways called: channels

Channels are made up of proteins in the cellmembrane

The movement of particles across the cell

membrane withoutenergy is called:Passive Transport

High concentration to low concentration(diffusion/osmosis)

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http://www.dwm.ks.edu.tw/bio/activelearner/05/images/ch05c3.gif

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The process of transporting particles thatrequires the cell to use energy is called:Active Transport

Area of low concentration to area of high concentration

Uses ATP for energy

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http://www.bio.miami.edu/~cmallery/150/memb/c8.7x17.transport.jpg

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2 processes for moving large particles; the1st:

ENDOCYTOSIS: active transport process where a

large particle (ex: protein) encloses the particle in avesicle to bring the particle into the cell

Vesiclesare sacs formed from pieces of cell

membrane

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https://reader010.{domain}/reader010/html5/0627/5b32e73f5ccca/5b32e745a5389.jpg

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What part of the cell do materials passthrough to get into and out of the cell?

What is osmosis?