exchange surface Flashcards

(7 cards)

1
Q

factors that affect the need for an exchange system

A

size
surface area to volume ratio
level of activity

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2
Q

how does size affect exchange system

A

small organism - diffusion is sufficient enough

as the organism get bigger the diffusion pathway gets longer so diffusion is to slow to enable a sufficient supply to the innermost cell

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3
Q

SA:V ratio affect exchange system

A

as size increase the SA and V increase but the ratio decrease

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4
Q

level of activity affect exchange system

A

more active = more nutrients need as more energy (ATP) is need

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5
Q

feature of all exchange surface

A

-large SA
-thin, permeable layers
-short diffusion distance
-maintenances of steep concentration gradient

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6
Q

what is a another feature of mammalian lung have

A

surfactant - reduces the cohesion between water and stops the alveoli collapsing

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7
Q
A
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