Topic Content:
- Open Circulation
- Closed Circulation
The circulatory system can either be open or closed depending on whether blood flows freely in a cavity or is contained in vessels.
Open Circulation:
It is found in arthropods and molluscs, the heart pumps blood into a cavity called the haemocoel.
Organs in contact with haemocoel exchange materials with the blood. The blood flows back to the heart in the vessels.
Closed Circulation:
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