The type of circulatory system in which blood is confined to vessels is called:

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In a closed circulatory system (e.g., humans, annelids, cephalopods), blood is always enclosed within vessels (arteries, veins, capillaries) and is distinct from interstitial fluid. Open systems (arthropods, most mollusks) have hemolymph bathing organs in sinuses. The lymphatic system returns fluid to blood. A portal system connects two capillary beds.

The type of circulatory system in which blood is confined to vessels is called: MCQ with Answer and Explanation

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