In this type of vessel formation, the capillary wall extends into the lumen to split a single vessel in two.
From the en.wikipedia.org
These components are a hermetically sealed hollow vessel, a working fluid, and a closed-loop capillary recirculation system.
From the en.wikipedia.org
Although endothelial cells play an essential role in vasculogenesis and angiogenesis and form capillary vasculatures, they alone cannot complete the process of vessel growth and development.
From the foxbusiness.com
Secondly, capillary beds also consist of a vascular shunt which is a short vessel that directly connects the arteriole and venule at opposite ends of the bed.