Question

In a closed circulatory system, blood is completely enclosed within
(a) vessels
(b) heart
(c) skeleton
(d) sinuses

Answer 1

Answer:

Vessels

Explanation:

The blood always remains inside the blood vessels and never comes in direct contact with the cells....The blood vessels are branched into find capillaries which are actually involved in the exchange of materials .

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Answer 2

Answer:

vessels is the correct answer