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Akimi4 [234]
4 years ago
5

Why is the cardiovascular system considered closed?

Health
2 answers:
Dafna1 [17]4 years ago
8 0

Answer:

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

mote1985 [20]4 years ago
5 0
Vertebrates have closed circulatory systems their blood flows through blood vessels like veins and arteries and they have a heart to push the blood around the body. thats why the human circulatory is a closed system
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