Distinguish between open and closed circulation.
|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.|
|e.g. Arthropods and molluscs||e.g. All vertebrates, higher molluscs and annelids|
Concept: Circulation in Animals
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