topic 3 - movement across cells Flashcards

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1
Q

what is diffusion?

A

the movement of molecules from an area of high concentration to an area of low concentration

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2
Q

what is osmosis?

A

the movement of water molecules from an area of high concentration to an area of low concentration through a partially permeable membrane.

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3
Q

what is active transport?

A

the movement of a substance from and area of low concentration to an area of hight concentration. this requires energy as it is moving against the concentration gradient.

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4
Q

what are some factors affecting the rate of diffusion?

A
  • temperature
  • surface area
  • distance
  • concentration gradient
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