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

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?

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.