Question

distinguish between open and closed type of circulatory system.

Answer 1

OPEN CIRCULATORY SYSTEM
1. Blood flows in open tissue spaces, the sinuses, without proper walls.
2.Blood is in direct contact with the tissue cells.
3.Blood flow is very slow.
4.This type of system is less efficient as the blood flow cannot be regulated.
5. Occurs in arthropods and most mollusks.

CLOSED CIRCULATORY SYSTEM
1. Blood flows in closed tubes, the blood vessels, with definite walls.
2. Blood does not come in direct contact with the tissue cells.
3. Blood flow is quite rapid.
4. The system is more efficient as the blood flow can be regulated.
5. Occurs in annelids and vertebrates.

Answer 2

in open circulatory system the blood circulate within the open body sinuses. blood vessels are absent.the blood transports food only. the blood cavity of animal is called HAEMOCOEL.in this system there is no distinction between blood and interstitial fluid.this fluid is called HAEMOLYMPH.Blood is colorless without haemoglobin. Blood pressure remains low.

CLOSED CIRCULATORY SYSTEM
in this circulatory system the blood flow inside the blood vessels.and blood transports food and oxygen. the body cavity in this system is called COELOM,which is true body cavity.and blood is separated from interstitial fluid.Blood is red contain haemoglobin.Blood pressure remains high.

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