SA:V + metabolic rate

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6 Terms

1
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how is SA:V calculated?

SA/V → SA:1

2
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how does organism structure affect SA:V?

increased size increases SA:V

thin/flat/folded/elongated structures increase SA:V

3
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metabolic rate?

amt of energy used up organism within given time period

4
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how is metabolic rate measured?

often by O2 uptake as it is used in respiration to make ATP for energy

5
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how does increased SA:V increase metabolic rate?

  • rate of heat loss per unit of body mass increases

  • so more respiration required

  • to release enough heat to maintain a constant body temp, eg. replace lost heat

6
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how is efficient exchange enabled in organisms with smaller SA:V?

  • changes to body shape: long + thin increases SA, overcoming long diffusion pathway

  • organs have adaptations eg. lungs