GCSE Biology B3

All questions covering B3.

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  • Created by: Amy Clee
  • Created on: 13-05-11 12:57

Gas Exchange

Name 3 ways which solutes can move.

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Diffusion, Osmosis and Active Transport.

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What route does the oxygen take to get into the blood stream?

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Nose to mouth to trachea to to bronchi to bronchioles to alveoli to blood.

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Breathing in

What happens when during inhalation?

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The intercostal muscles and diaphragm contract (to increase surface area)
The pressure is decreased which draws air into the body.

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What adaptations do the alveoli have to maximise diffusion?

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A large surface area
Moist (for dissolving gases)
Very thin membrane
A copius blood supply

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Where are the Villi and what are their adaptations?

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The small intestine.
Large surface area for absorbing food quickly into the blood
A single layer of surface cells
A copious blood supply.

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Active Transport

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