The human cardiovascular system is considered closed because __________.

Health

2 answers:

Levart [38]3 years ago

6 0

Answer:

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

Mandarinka [93]3 years ago

3 0

Vertebrates, and a few invertebrates, have a closed circulatory system. Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities.

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