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Diffusion, Osmosis, and Cellular Transport. Movement of Particles. A toms and molecules collide causing them to move around randomly Causes diffusion. Diffusion. When molecules move from an area of high concentration to low concentration No energy required

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Presentation Transcript
movement of particles
Movement of Particles

Atoms and molecules collide causing them to move around randomly

Causes diffusion

diffusion
Diffusion
  • When molecules move from an area of high concentration to low concentration
  • No energy required
  • http://www.biologycorner.com/bio1/diffusion.html
dynamic equilibrium
Dynamic Equilibrium

Diffused particles eventually reach a dynamic equilibrium

Dynamic= changing, moving

Equilibrium = balanced

Molecules will continue to move but no overall concentration change

http://www.biosci.ohiou.edu/introbioslab/Bios170/diffusion/Diffusion.html

cell membrane
Cell Membrane
  • Maintains homeostasis (balance) by controlling what comes in and what goes out
  • Semi-permeable- some substances can pass freely in and out of the cell while others do not
cell membrane cont
Cell Membrane cont.

Made of a phospholipidbilayer

And proteins (2 types)

Transport proteins- move substances across membrane

Signal proteins- communicate with other cells

diffusion into cells
Diffusion into Cells
  • Particles that are small and have no charge can get into the cell by diffusing directly through the membrane (between phospholipids)
    • CO2, O2, H2O
  • Large particles (like glucose) must enter and exit through a membrane protein in a process called facilitated diffusion
    • It’s still diffusion, so no energy needed
  • The diffusion of water has a special name called osmosis
    • Again, it’s a type of diffusion so no energy needed
facilitated diffusion
Facilitated Diffusion

Large molecules moving with the concentration gradient (high to low) use a protein to facilitate (help) their crossing the cell membrane

Diffusion = no energy!

osmosis
Osmosis

The diffusion of water

Water moves from high concentration to low concentration across the cell membrane

http://www.biologycorner.com/bio1/diffusion.html

Water concentration is affected by the amount of solute dissolved in the water

osmosis in cells
Osmosis in Cells

Water moves either in or out of the cell depending on the concentration of water inside and outside the cell

Hypotonicsolution- water concentration greater outside the cell

Water moves into the cell

Hypertonic solution- water concentration less outside the cell

Water moves out of the cell

Isotonic solution- water concentration the same both in and out of the cell

Same amount of water moves in and out of the cell

passive transport
Passive Transport

Diffusion, facilitated diffusion and osmosis are all forms of passive transport because each moves substances in and out of the cell without any energy input by the cell

active transport
Active Transport
  • Substances are moved in and out of the cell against the concentration gradient (from low concentration to high concentration)
  • Requires energy