explain briefly why an open circulatory system not as efficient as a closed circulatory system.
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Open circulatory system
Open circulation is found in invertebrates like prawn, insects, and molluscs.
1. Blood flows through open spaces called lacunae and sinuses
2. Blood flows at a very slow velocity
3. Body cavity is filled with blood (Haemocoel*)
4. Internal organs are bathed by blood
5. Blood takes long time to complete
6. Supply and elimination of materials are very slow
7. Exchange of materials takes place between blood and sinuses
Closed circulatory system
Invertebrates , the heart and blood vessels form a closed system
1. Blood flows through closed vessels
2. Blood flows at a very high velocity
3. Haemocoel is absent
4. Internal organs are not in direct contact with blood
5. Blood takes short time to complete
6. Supply and elimination of materials are very rapid
7. Exchange of materials between blood and tissues takes place through the capillaries
Open circulation is found in invertebrates like prawn, insects, and molluscs.
1. Blood flows through open spaces called lacunae and sinuses
2. Blood flows at a very slow velocity
3. Body cavity is filled with blood (Haemocoel*)
4. Internal organs are bathed by blood
5. Blood takes long time to complete
6. Supply and elimination of materials are very slow
7. Exchange of materials takes place between blood and sinuses
Closed circulatory system
Invertebrates , the heart and blood vessels form a closed system
1. Blood flows through closed vessels
2. Blood flows at a very high velocity
3. Haemocoel is absent
4. Internal organs are not in direct contact with blood
5. Blood takes short time to complete
6. Supply and elimination of materials are very rapid
7. Exchange of materials between blood and tissues takes place through the capillaries
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Within the hemocoel, hemolymph directly absorbs nutrients from food and oxygen from the lungs or breathing pores. ... This is one or several reasons why there are no giant insects; open circulatory systems are less efficient than closed circulatory systems, and cannot move oxygen efficientlyenough to power large bodies.
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