Briannaball109 Briannaball109
  • 28-09-2016
  • Health
contestada

The human cardiovascular system is considered closed because

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quinnster quinnster
  • 28-09-2016
we have blood vessels that transport the blood throughout the body. the blood cells are confined within these vessels and could only flow in one direction....
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cburnes93
cburnes93 cburnes93
  • 16-10-2019

Answer:

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

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