A-Level Biology OCR A
Blood Single Pressure Advantages Disadvantages Double Complex Animals
| Front |
Draw a table to show the advantages and disadvantages of single and double circulatory systems. |
| Back |
| Advantages | Disadvantages |
|---|
| Single | - Less complex - does not require complex organs
- Sufficient for less metabolically active animals such as fish that do not maintain body temp and their body weight is supported by water
|
- Blood is at lower pressure and moves more slowly - slower delivery to tissues
- Less efficient so the activity of animals with single closed circulation is lower
- Oxygenated and deoxygenated blood mixed
| | Double | - Pressure of blood can be adjusted
- Higher pressure and fast flow of blood mean oxygen delivered more rapidly and farther away
- No mixing of oxygenated and deoxygenated blood - conc gradient for diffusion
|
| |
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A-Level Biology OCR A