A-Level Biology OCR A
Blood Open Diffusion Advantages Disadvantages Closed Requires Energy
| Front |
Draw a table to show the advantages and disadvantages of open and closed circulatory systems. |
| Back |
| Advantages | Disadvantages |
|---|
| Open | - Requires less energy for distribution
- More suitable for animals with slow metabolism and smaller body
| - Blood is at low pressure so it is distributed slowly
- Steep diffusion gradients cannot be maintained for efficient diffusion
- Amount of haemolymph flowing to particular tissue cannot be varied
- Little control of direction of flow & flow is affected by movement
| | Closed | - Blood is at high pressure so blood flows rapidly meaning faster & more efficient distribution of oxygen & removal of waste
- Amount of blood flowing can be adjusted by narrowing blood vessels
- Steep diffusion gradients are able to be maintained
| - Requires more energy compared to open
| |
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A-Level Biology OCR A