Question
Distinguish between: Open circulation and Closed circulation
| Open circulation | Closed circulation |
| 1. In open circulation, blood flows through large open spaces and channels called lacunae and haemocoels among the tissues. | 1. In closed circulation, blood flows through a network of blood vessels all over the body. |
| 2. Tissues are in direct contact with the blood. | 2. Blood does not come in direct contact with tissue. |
| 3. Blood flows with low pressure and usually does not contain any respiratory pigment like haemoglobin. | 3. Blood flows with high pressure and contains respiratory pigment like haemoglobin. |
| 4. Exchange of material takes place directly between blood and cells or tissues of the body. | 4. Exchange of material takes place between blood and body tissues through an intermediate fluid called lymph. |
| 5. Volume of blood flowing through a tissue cannot be controlled as blood flows out in open space. | 5. Volume of blood can be regulated by the contraction and relaxation of the smooth muscles of the blood vessels. |
| 6. Open circulatory system is found in arthropods and some molluscs. | 6. Closed circulatory system is found in annelids, echinoderms and all vertebrates. |
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