B2.3.6 - SA:V ratio and constraints on cell size

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7 Terms

1
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What does surface area affect?

the rate of diffusion in and out of the cell

2
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What does volume affect?

the amount of materials that needs to be exchanged - the rate of metabolism

3
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How does an increase or decrease in cell volume affect the cell?

  • if big, more effort and energy is required for metabolic actions and processes

  • if small, substances are used and processes are quicker and more efficient

4
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How does an increase or decrease in S.A. affect the cell?

  • if big, the cell may lose heat (energy) too rapidly - high metabolism is needed to compensate

  • if small, required substances and heat cannot enger/ exist the cell through the cell membrane quickly enough → overheating

5
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What is the equation for SA:V ratio?

SA(mm²)/V(mm³)

6
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Three ways organelles increase SA:V ratio

  • flattening: making cells wide and thin

  • microvilli: finger-like extensions

  • invagination: folding inwards to create cavities

7
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importance of SA:V ratio in biological context

  • efficient transport

  • metabolic rate

  • fast diffusion