Closed circulation is more efficient than open circulation.

1. Closed circulation considerably enhances the speed, precision and efficiency of circulation. 
2. The blood flows more rapidly, it takes less time to circulate through the closed system and return to the heart. 
3. This fastens the supply and removal of materials to and from the tissues by the blood as compared to open circulation. 
4. In open circulation, there are no blood vessels such as arteries or veins, to pump the blood. 
5. Therefore, the blood pressure is very low. 
6. Organisms with an open circulatory system typically have a relatively high volume of hemolymph and low blood pressure. Closed circulation is thur more efficient than open circulation.