7.1 Flashcards

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1
Q

why do single-celled organisms not need specialised transport systems?

A

they have:
- a large SA:V ratio
- a low metabolic activity

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2
Q

what features do an effective exchange system have?

A
  • increased surface area
  • thin layers
  • good blood supply
  • good ventilation
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3
Q

how does an increased surface area improve gas exchange?

A

provides a larger area for gaseous exchange to occur over

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4
Q

how do thin layers improve gas exchange?

A

provides a short diffusion distance which makes gaseous exchange faster

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5
Q

how does a good blood supply improve gas exchange?

A

provides a steep concentration gradient which means faster diffusion

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6
Q

how does good ventilation improve gas exchange?

A

maintains a steep concentration gradient

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