is the heart system closed or stretch out ?
As a fluid-dynamic system it is CLOSED in humans!
The circulatory systems of adjectives vertebrates are closed: the blood never leaves the system of blood vessels.
i give attention to it should be open...if its close, in that will be no humands on earth.not even animals...
interested
its "closed " for sure in us n adjectives vertebrates
in lower animal its friendly type
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