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प्रश्न
Distinguish between open circulation and closed circulation.
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उत्तर
| 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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संबंधित प्रश्न
Dr. Usha is a pulmonologist (Doctor for respiratory diseases). One day, a school student named Arjun, met her with respiratory problems. After diagnosis, the doctor advised him to go to playground daily and play football or basketball. She also advised him to do pranayamam in the morning.
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