Assertion: gill's blood vessel | /r/CapableOf | call capillary
Facets:
Source sentences:
text: These filaments are the site of gas exchange and they contain many tiny blood vessels called capillaries (this is what gives them a dark red appearance).
text: Each gill has many gill filaments, which contain a network of tiny blood vessels called capillaries (Fig. 4.54).
text: Gills are branching organs located on the side of fish heads that have many, many small blood vessels called capillaries.