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What substances How is a high surface area How is How is
are exchanged? created? concentratio distanced to
n gradient diffuse
maintained? minimized?
Alveoli in Oxygen to the Covers the lungs, air sacs Very rich Very thin
the lungs blood remove are kept close together, the blood supply, walls.
carbon…

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copious
blood supply.




Villi [in small intestine] Incredibly small strands ­ Very good Each tiny
food molecules each villi is covered with blood supply blood vessel
moves from the thousands of microvilli. to assist supplies
inside of the small quick each villi,
intestine to the absorption - they have a…

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photosynthe
size
Insect Oxygen and Tracheoles have a very Can open
tracheole carbon dioxide for large surface area, when it needs
s their respiratory a lot of
system. oxygen, and
closes when
it doesn't.
freely
permeable.
Very moist
and and air is
pumped into
them.
Roots Active transport The cells…

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