adj, noun ·Moderate ·College level
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"Incidentally, that the gills of fish are bright red is because there are many 'capillary vessels' collected there, the same as for lungs."
Any of the small blood vessels (from 5 to 10 micrometres/micrometers (μm) in diameter) that connect arteries to veins (They are the smallest blood vessels in the body: they convey blood between the arterioles and venules).
Common synonyms include: capillary vessel, aorta, arterial, arteriole, artery, blood vessel.
Incidentally, that the gills of fish are bright red is because there are many 'capillary vessels' collected there, the same as for lungs.
Pronounced /kəˈpɪl.ə.ɹi/.
From Latin capillāris (“pertaining to the hair”), from capillus (“the hair, properly of the head”), from caput (“head”).