- Open Circulatory System: In invertebrates like arthropod (insects, spiders) and certain molluscs, blood that is pumped by the heart into the arteries flows into a series of blood spaces within the body called sinuses.
- The body cavity in organisms having open circulatory system is called haemocoel and the blood is called haemolymph. Since the blood does not remain confined within the vessels, such a circulatory system is said to be 'open'.
Open Circulatory System in Grasshoppers
- Closed Circulatory System: In invertebrates like annelids, echinoderms and all vertebrates, blood flows through closed vessels, consisting of
- Arteries
- Capillaries
- Veins
Closed Circulatory System in Earthworms
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