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ohaa [14]
4 years ago
6

Why is the human cardiovascular system considered closed?

Biology
2 answers:
g100num [7]4 years ago
4 0
The blood circulates, so blood is reused constantly. There's no break in the circle, so it is a closed system
Pepsi [2]4 years ago
4 0

Answer:

There are no holes for blood to enter or leave the system

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