State THREE differences between open and closed system of circulation. – NABTEB QUESTION
by Sunday | Sep 22 | NABTEB QUESTIONS |
| 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 |