A closed circulatory system keeps blood contained within blood vessels, with exchange occurring across the vessel walls rather than direct contact with tissues.
A closed circulatory system confines the blood within blood vessels, preventing direct contact with body cells except through vessel walls.
| Front | Define closed circulatory system. |
|---|---|
| Back | Closed circulatory system - a circulatory system where the blood is enclosed in blood vessels and does not come directly into contact with the cells of the body beyond the blood vessels |
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