Choose the correct answer from the alternatives given.
In a closed circulatory system, blood is completely enclosed within:

Heart

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Vessels

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Sinuses

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Coelom

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Solution

The correct option is B Vessels
Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels and does not normally fill body cavities.
So, the correct option is 'Vessels'.

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