| OPEN SYSTEM CIRCULATION | CLOSE SYSTEM CIRCULATION |
| Heart not chambered | Chambered heart |
| Few short blood vessels for a short distance and for a while | Blood flows in long vessels all the time |
| Blood flows into coelum for some time | Blood remains in vessels throughout |
| No capillaries | Presence of complex network of capillaries |
| Organs are bathed by blood | Organs are supplied with blood by vessels |
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