diffusion and facilitated diffusion Flashcards

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1
Q

where does diffusion happen?

A

across the cell surface membrane

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2
Q

what is the definition of diffusion?

A

the net movement of particles from a region of high concentration to low concentration

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3
Q

do molecules move up or down the concentration gradient in diffusion?

A

down

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4
Q

what are the 4 main factors effecting the rate of diffusion?

A
  1. temperature
  2. steepness of concentration gradient
  3. surface area
  4. properties of the molecule
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5
Q

why does temperature increase diffusion?

A

there is more kinetic energy

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6
Q

why does a higher surface area mean more diffusion?

A

more molecules can cross at any given time

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7
Q

why do smaller molecules diffuse quicker?

A

large molecules need more energy

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8
Q

why do non-polar molecules diffuse quicker?

A

they are soluble in the phospholipid bilayer

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