| Open circulatory system | Closed circulatory system |
|---|---|
| $(1)$ Blood flows in spaces called sinuses,and cells and tissues are directly bathed in blood. | $(1)$ Blood flows through a closed network of vessels (arteries,veins,and capillaries). |
| $(2)$ The flow of blood is slow and under low pressure. | $(2)$ The flow of blood is rapid and under high pressure. |
| $(3)$ Examples include Arthropods and most molluscs. | $(3)$ Examples include Annelids and all vertebrates. |
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