A-Level Biology OCR A
Circulation Closed Open Blood Similarities Differences Involve Vessels
| Front |
Draw a table to show the similarities & differences between open and closed circulatory systems. |
| Back |
Open & closed circulation:
| Similarities | Differences |
|---|
- Both involve a pump organ (heart)
- Both involve a transport medium and some blood vessels
| - In open circulation - haemolymph bathes organs and tissues directly, in closed circulation blood circulates within closed vessels and body cells do not come into contact with blood directly
- A capillary system is found in closed circulation and not in open circulation
- Haemolymph in open circulation does not carry oxygen, blood in closed circulation does
- In closed circulation blood is at a higher pressure than in open circulation
- Open circulation occurs in invertebrates like insects, closed circulation in all vertebrates
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A-Level Biology OCR A