A-Level Biology OCR A
Supply Increase Organisms Cells Large Diffusion Explain Meeting
| Front |
Explain why supply meeting demand requires adaptations as organisms increase in size. |
| Back |
As organisms increase in size:- They are made up of more cells that all require constant and large supply of O and removal of CO2
- Their metabolic rate is usually higher meaning more respiration needs to occur
- Diffusion distances will increase - not possible to supply cells deeper inside the organism through just the surface
- Smaller SA:V ratio - slow diffusion and gases cant be exchanged fast enough or in large amounts
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A-Level Biology OCR A