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bonufazy [111]
3 years ago
12

The human cardiovascular system is considered closed because __________.

Health
2 answers:
tester [92]3 years ago
8 0
Blood travels throught blood vessels and cells get their blood supply only from vessels. And blood doesnt flow into body(selom) itself.
Usimov [2.4K]3 years ago
4 0

Answer:

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

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