Define the circulatory system of animals. What are its main types?

Define the circulatory system of animals. What are its main types? 
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1 Answer

Answer :

It is system by which materials are transported within the body in a fluid which circulates in the body. In many vertebrates this fluid is called hemolymph, while in all vertebrates and in some higher invertebrates this fluid is called blood. There are two types of circulatory system: -

Open Circulatory System: -

• In this type blood is pumped through heart in open spaces called sinuses.

• The blood is in direct contact with tissues and after exchange of materials it

returns back to heart.

Closed Circulatory System: -

• In this type muscular heart is present with its incoming (veins) and out going

(arteries) vessels. The blood remains confined to the blood vessels during

circulation.

• It is elaborated, complicated and efficient system.  
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