6.1 Exchange Flashcards

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1
Q

Explain what happens to SA:VOL as a cell becomes larger?

A

As organisms become larger their VOL increases out a faster rate then their SA

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2
Q

Explain why cell size is limited?

A

Due to it allowing efficient exchange across their body surface

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3
Q

Name 3 features of specialised exchange surfaces?

A
  1. Larger SA relative to VOL of organism
  2. Very thin so that the diffusion is short and rapid
  3. A transport system to ensure the movement of the internal medium
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4
Q

Define ficks law?

A

Diffusion= SA x difference in concentration/ length of diffusion path

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