Capillaries
Very fine blood vessels are called capillaries.
A link.
The term for the connection between bones and muscles is called the musculoskeletal junction.
A synapse.
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A Gateway.
The term for the transfer of energy between systems is called "energy transfer."
The connection between cultures around the world is called: GLOBALIZATION
ductus arteriosus
arterial anastomosis
hypoxia
Arterial circulation.