In a closed circulatory system, blood is completely enclosed within the:

Skeleton

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Sinuses

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Vessels

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Heart

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Solution

The correct option is C Vessels
The closed circulatory system is where the blood flows into specialized blood vessels such as arteries, veins and capillaries. In the closed circulatory system, the blood never comes out in direct contact with the tissues. For example, human being, dogs, rat, etc.
So, the correct answer is option C.

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