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Biology Year 10 Mocks
B5 - The Human Body: Staying Alive
Exchange Surfaces
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Cards (4)
Villi
Finger-like
projections on the inner wall of the
small intestine
that increase the surface area for
absorption
Root hair cells
Increase the
surface area
of plant roots for
absorption
Surface area to volume ratio is the reason
large organisms
are made of many small cells, and why
cells
are so small
Large
organisms need exchange surfaces to increase surface area above just having many, tiny
cells
- makes exchange of substances much more efficient