Exchange surfaces AQA Module 3

What is the 'surface area' of an organism?

• The area over which substances can be exhanged.

• The total surface area over which the substances can be exchanged.

• Ration of surface area to volume

Sa:V ratio means

Surface area to volume ratio (SA:Vol) is important because

• Increased volume ensures more efficient substance exhange

• Increased surface area ensures more efficient substance exhange

• Decreased volume to surface area ratio ensure more efficient substance exchange

• Decreased surface area to volume ratio ensure more efficient substance exchange

Calculate Sa and volume of a cube where one side is 1cm long

Surface area formula for a sphere is:

• 4 π r

• 4 π r2

• 4 π r3

• 2 π r2

Organs to facilitate gas exchange in humans are

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Except for the heat, the exchange will happen in passively through

Except for the heat, the exchange can happen actively using

What are the substances organisms will exchange?

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What did you find the hardest in yesterday's lesson?

• Explain how the size of an organism affects its surface area to volume ratio and why this is important.

• Apply knowledge of surface area to volume ratio, to explain adaptations to body shape or the development of exchange systems.