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Question
Distinguish between open circulation and closed circulation.
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Solution
| Open circulation | Closed circulation | ||
| 1. | In open circulation, blood is circulated through the body cavities (haemocoels). | 1. | In closed circulation, blood circulates the blood vessels and does not come in direct contact with cells and body tissues. |
| 2. | The blood flows with low pressure. | 2. | The blood flows with high pressure. |
| 3. | Exchange of material takes place directly between blood and cells or tissues of the body. | 3. | Exchange of material between blood and body tissues is through intermediate fluid called lymph. |
| 4. | It usually does not contain any respiratory pigment like haemoglobin so it does not transport respiratory gases | 4. | It contains respiratory pigments like haemoglobin for transportation of respiratory gases. |
| 5. | e.g. Arthropods and molluscs | 5. | e.g. All vertebrates, higher molluscs and annelids |
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