B3, Movement of molecules in and out of cells

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  • Created by: emmajane_
  • Created on: 19-04-14 15:30
What is active transport? What does it require to take place?
The movement of dissoled molecules from a low concentration to a high concentraton against the gradient. Reqires energy from respiration to take place.
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Name two examples of active transport
1. Root hair cells 2. Small intestine villi cells
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What is osmosis?
The movement of water molecures from a high comcentration to a low concentration across a partially permeable membrane
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What is the effect of a cell having a more dilute inside to outside, causing water to move out, in animal cells?
It causes cells to shirvel up
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What is the effect of a cell having a more dilute inside to outside, causing water to move out the cell, in a plant cell
It Causes the membrane and cytoplasm to shrivel away from the cell to go flaccid
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Why is it important that the concentration outside an animal cell is comstant?
Otherwise the cell will burst
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What causes a plant cell to become turgid?
If a cell has a higher conentration inside than out,water will still move inside the cell. This causes the membrane and cytoplasm push against the cell wall, exand and become turgid
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What are villi?
Folds within the small intestine which digested food molecules are exchanged between the gut and bloodstream. This happens because of active transport
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What are villi made of and what is the purpose of them?
They are one cell thick and they increase the surface area of the small intestine
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Other cards in this set

Card 2

Front

Name two examples of active transport

Back

1. Root hair cells 2. Small intestine villi cells

Card 3

Front

What is osmosis?

Back

Preview of the front of card 3

Card 4

Front

What is the effect of a cell having a more dilute inside to outside, causing water to move out, in animal cells?

Back

Preview of the front of card 4

Card 5

Front

What is the effect of a cell having a more dilute inside to outside, causing water to move out the cell, in a plant cell

Back

Preview of the front of card 5
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