B1.10 Exchanging materials Flashcards

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1
Q

What are the problems of having a small surface area to volume ratio?

A

Gases and food molecules can no longer reach every cell inside the organism by simple diffusion
Metabolic waste cannot be removed fast enough to avoid poisoning the cells

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2
Q

How can the process of exchange be made more efficient?

A

Having a thin membrane
Large surface area to volume ratio
Efficient blood supply maintains a steep concentration gradient

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3
Q

What is the alveoli?

A

Tin air sacs that move air into and out of your body

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4
Q

How are the alveoli adapted?

A

Enormous surface area and have a very rich bloody supply

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5
Q

How are the gills adapted?

A

They have a rich blood supply

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6
Q

How does the fish get a constant flow of water over their gills?

A

They maintain concentrations needed for gas exchange - they get this by pumping water over the gills using a flap that covers the gills

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