Biology - Movement of molecules: osmosis, active transport and exchange - B3.1.1

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  • Created by: shcoool
  • Created on: 15-05-15 21:09
How do dissolved substances move?
By diffusion and by active transport
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Define osmosis
Osmosis the the diffusion of water from an area of high water concentration (a dilute solution) to a region of low water concentration (a more concentrated solution) through a partially permeable membrane
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What causes water to move into or out of the cell by osmosis?
Differences in the concentrations of the solutions inside and outside the cell
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What di mist sport drinks contain?
water, sugar and ions
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Why do sports drinks contain sugars?
to replace the sugar used in energy release during the activity
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Why do sports drinks contain water and ions?
to replace the water and ions lost in sweating
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What happens if water and ions are not replaced?
the ion/water balance is disturbed and the cells do not work efficiently
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What do you call the process of absorbing substances against a concentration?
active transport
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What does active transport require?
energy
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What does active transport enable?
It enables cells to absorb ions from very dilute solutions
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Name two organs systems in both a body and a plant that are specialised for exchanging materials
lungs (alveoli), small intestine (villi), leaves, roots
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Give foour ways you can increase the effectiveness of exchange
large surface area, short diffusion path (thin), maintain a concentration gradient (efficient blood supply and ventilation)
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How do the lungs and small intestine increase surface area?
alveoli, cilli - large surface area and extensive network of capillaries to absorb products of digestion
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Other cards in this set

Card 2

Front

Define osmosis

Back

Osmosis the the diffusion of water from an area of high water concentration (a dilute solution) to a region of low water concentration (a more concentrated solution) through a partially permeable membrane

Card 3

Front

What causes water to move into or out of the cell by osmosis?

Back

Preview of the front of card 3

Card 4

Front

What di mist sport drinks contain?

Back

Preview of the front of card 4

Card 5

Front

Why do sports drinks contain sugars?

Back

Preview of the front of card 5
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