Biology - B3.1.1 Dissolved Substances

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  • Created by: Millie
  • Created on: 10-04-13 20:27
Haw do dissolved Substances move?
Diffusion and Active Transport
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What is the movement of water across a partially permeable membrane called?
Osmosis
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Which direction does water move across a partially permeable membrane?
From a dilute to a more concentrated solution
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What causes osmosis?
A difference in the concentrations of the solutions inside and outside a cell
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What do most soft drinks contain?
Water, sugar and ions
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Why do sports drinks contain sugar?
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 during sweating.
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What is active transport?
When substances are absorbed against a concentration gradient
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What does active transport need?
It requires the use of energy from respiration
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How does having a large surface area and a small diffusion distance affect efficiency of exchange?
Increases it
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How is surface area increased in lungs?
Alveoli
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What do the villi provide?
Both a large surface area with an extensive network of capillaries to absorb the products of digestion by diffusion and active transport
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Where are the lungs found?
Thorax
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What protects the lungs?
Ribcage
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How does air move into the lungs?
The ribcage moves out and up and the diaphragm becomes flatter
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What is the movement of air into and out of the lungs called?
Ventilation
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Other cards in this set

Card 2

Front

What is the movement of water across a partially permeable membrane called?

Back

Osmosis

Card 3

Front

Which direction does water move across a partially permeable membrane?

Back

Preview of the front of card 3

Card 4

Front

What causes osmosis?

Back

Preview of the front of card 4

Card 5

Front

What do most soft drinks contain?

Back

Preview of the front of card 5
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