Diffusion, Osmosis and Active Transport Flashcards

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1
Q

Define diffusion

A

Movement of substances from a high concentration to a low concentration

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2
Q

What 4 things can affect the rate of diffusion?

A

Concentration gradient
Surface area
Distance
Temperature

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3
Q

Define osmosis

A

Movement of water from a high water potential (low concentration) to a low water potential (high concentration) through a partially permeable membrane

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4
Q

Define dilute solution

A

Have a high concentration of water particles

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5
Q

Define concentrate solution

A

Have low concentration of water particles

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6
Q

What happens if cells are placed in distilled water?

A

They swell up and burst

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7
Q

What happens if cells are placed in a concentrated salt solution?

A

They shrink and shrivel

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8
Q

Define active transport

A

Movement of substances from a low concentration to a high concentration. it needs energy to move against the concentration gradient.

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9
Q

Name 2 ways that active transport differs from diffusion

A

Uses energy

Against concentration gradient

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10
Q

Where does the energy needed for active transport come from?

A

Respiration in cells (mitochondria)

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