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in closed circulatory system blood is en...

in closed circulatory system blood is enclosed by

A

Tubes

B

Ducts

C

Valves

D

Vessels

Text Solution

Verified by Experts

The correct Answer is:
D

Circulatory system is of two types :
* Open circulatory system – Blood flows directly in a fluid filled cavity is called open circulatory system.
Ex: In all invertebrates except annelida.
* Closed circulatory system – Blood flows in blood vessels. Ex: In all vertebrates and annelida.
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