Unit 1: cholera and exchange Flashcards

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0
Q

What is facilitated diffusion?

A

When particles are helped by protein channels to pass through the cell membrane

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1
Q

At what point does diffusion/ osmosis stop?

A

When equilibrium is met

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2
Q

What three things affect diffusion?

A
  • concentration
  • thickness of membrane
  • surface area
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3
Q

How do you calculate the speed of diffusion?

A

SA x difference in conc. / length of pathway

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4
Q

Why is facilitated diffusion passive?

A

No energy is required

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5
Q

Why do some cells diffuse via the protein channels?

A

They’re soluble and so would dissolve in the phospholipid membrane

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6
Q

What is osmosis?

A

The movement of water from a less negative water potential to a more negative water potential

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7
Q

What does it mean if something has a more negative water potential?

A

It has more water

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8
Q

What is active transport?

A

Where energy is required to move a particle across a concentration gradient

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9
Q

What does ATP do to the protein channel?

A

It changes the shape so particles can move through it

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10
Q

What is co transport?

A

Where two molecules move via active transport across the protein channels

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11
Q

How is cholera caused?

A

A prokaryotic cell that affects the small intestine

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12
Q

How do you treat cholera?

A

An oral rehydration containing water, sodium ions and glucose

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13
Q

How does oral rehydration hydrate a cell?

A

Co transport takes glucose into the cell with ions attached to it and then this reduces the water potential. Water is then caused to enter the cell and rehydrate it.

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